Ce mail provient de l'extérieur, restons vigilants ===================================================================== CERT-Renater Note d'Information No. 2026/VULN775 _____________________________________________________________________ DATE : 23/07/2026 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Bind versions prior to 9.20.26, 9.21.24, 9.20.26-S1. ===================================================================== https://kb.isc.org/docs/cve-2026-11721 https://kb.isc.org/docs/cve-2026-11622 https://kb.isc.org/docs/cve-2026-10723 https://kb.isc.org/docs/cve-2026-13204 https://kb.isc.org/docs/cve-2026-12617 https://kb.isc.org/docs/cve-2026-11605 https://kb.isc.org/docs/cve-2026-11331 https://kb.isc.org/docs/cve-2026-13321 https://kb.isc.org/docs/cve-2026-10822 _____________________________________________________________________ CVE: CVE-2026-11721 Title: Cache poisoning possible with label count discrepancy, RRSIG, and wildcards Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set synth-from-dnssec yes; (which is the default). Impact: Potential cache poisoning. CVSS Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Acknowledgments: ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-11721 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ Title: Potential memory usage beyond configured limits Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the max-cache-size parameter. Impact: Memory usage may exceed configured limits, and response rate may be affected. CVSS Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1. Workarounds: No workarounds known. Active exploits: This flaw was discovered in internal testing. We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-11622 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain _____________________________________________________________________ CVE-2026-10723: Incorrect acceptance of NSEC3 records CVE: CVE-2026-10723 Title: Incorrect acceptance of NSEC3 records Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.18.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: Medium Exploitable: Remotely Description: BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses. Impact: An attacker may be able to forge NXDOMAIN responses for other sibling zones. CVSS Score: 6.8 CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Acknowledgments: ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-10723 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ CVE: CVE-2026-13204 Title: Unexpected exit in certain situations with NSEC and NSEC3 both present Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof. Impact: BIND may exit unexpectedly resulting in a DoS while validating such a domain. CVSS Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Acknowledgments: ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-13204 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ CVE: CVE-2026-12617 Title: Record ordering based unexpected exit with CNAME or DNAME Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.18.0 -> 9.18.50 9.20.0 -> 9.20.24 BIND Supported Preview Edition 9.18.11-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, named may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. Impact: If one of these situations is encountered, BIND may exit with an assertion. CVSS Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Acknowledgments: ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-12617 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ CVE: CVE-2026-11605 Title: Unnecessary validation of DNSSEC signed records Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. Impact: Exhaustion of CPU resources. CVSS Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1. Workarounds: No workarounds known. Active exploits: This flaw was discovered in internal testing. We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-11605 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ CVE: CVE-2026-11331 Title: Potential wildcard CNAME RPZ policy bypass Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.16.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.16.8-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. Impact: If such a situation is encountered, the targeted RPZ rule may be bypassed. The condition could also lead to an unexpected exit. CVSS Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Acknowledgments: ISC would like to thank Laith Mash'al (0xmshal) for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-11331 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ CVE: CVE-2026-13321 Title: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: High Exploitable: Remotely Description: The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. Impact: An attacker controlling any DNSSEC-signed zone can craft NSEC records that span into victim zones, enabling cross-zone cache poisoning with authenticated denial-of-service responses (AD=1). CVSS Score: 8.6 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Acknowledgments: ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-13321 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. _____________________________________________________________________ CVE: CVE-2026-10822 Title: Key Record using PRIVATEDNS algorithm may lead to unexpected exit Document version: 2.0 Posting date: 22 July 2026 Program impacted: BIND 9 Versions affected: BIND 9.18.0 -> 9.18.50 9.20.0 -> 9.20.24 9.21.0 -> 9.21.23 BIND Supported Preview Edition 9.18.11-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.24-S1 Severity: Medium Exploitable: Remotely Description: If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.). That key must specify a PRIVATEDNS algorithm (253), and in the algorithm identifier, improperly give a length longer than the actual identifier data. The invalid identifier will be stored. If BIND later needs to render that record to text, it will use the invalid length during processing, leading to a consistency check failing. Impact: 9.20 and 9.21 may abort and exit unexpectedly. 9.18 has not actually been confirmed to exhibit the unexpected exit but does share the problem code. CVSS Score: 6.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H&version=3.1. Workarounds: No workarounds known. Active exploits: This flaw was discovered in internal testing. We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.26-S1 Document revision history: 1.0 Early Notification, 15 July 2026 1.1 Revised the list of fixed versions, 20 July 2026 2.0 Public disclosure, 22 July 2026 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should be posted as confidential GitLab issues at: https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861. The Knowledgebase article https://kb.isc.org/docs/cve-2026-10822 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. 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