Ce mail provient de l'extérieur, restons vigilants ===================================================================== CERT-Renater Note d'Information No. 2026/VULN334 _____________________________________________________________________ DATE : 27/03/2026 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running BIND versions prior to 9.20.21, 9.21.20, 9.20.21-S1. ===================================================================== https://kb.isc.org/v1/docs/cve-2026-1519 https://kb.isc.org/v1/docs/cve-2026-3104 https://kb.isc.org/v1/docs/cve-2026-3119 https://kb.isc.org/v1/docs/cve-2026-3591 _____________________________________________________________________ CVE-2026-1519: Excessive NSEC3 iterations cause high CPU load during insecure delegation validation Published on Mar 25, 2026 Darren Ankney CVE: CVE-2026-1519 Title: Excessive NSEC3 iterations cause high CPU load during insecure delegation validation Document version: 2.0 Posting date: 25 March 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.16.50 9.18.0 -> 9.18.46 9.20.0 -> 9.20.20 9.21.0 -> 9.21.19 BIND Supported Preview Edition 9.11.3-S1 -> 9.16.50-S1 9.18.11-S1 -> 9.18.46-S1 9.20.9-S1 -> 9.20.20-S1 (Versions prior to 9.11.0 were not assessed.) Severity: High Exploitable: Remotely Description: If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). Impact: If this issue is encountered, the resolver may experience excessive CPU consumption and a sharp decrease in the number of queries per second that it can handle. Authoritative services are believed to be unaffected by this vulnerability but it is important to read: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries Resolvers are affected by this vulnerability. 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: This is not recommended, but disabling DNSSEC (dnssec-validation no;) prevents exploitation of this issue. 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: 9.18.47 9.20.21 9.21.20 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.18.47-S1 9.20.21-S1 Acknowledgments: ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 18 March 2026 2.0 Public disclosure, 25 March 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 mailed to bind-security@isc.org or 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-2026-1519 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-2026-3104: Memory leak in code preparing DNSSEC proofs of non-existence Published on Mar 25, 2026 Darren Ankney CVE: CVE-2026-3104 Title: Memory leak in code preparing DNSSEC proofs of non-existence Document version: 2.0 Posting date: 25 March 2026 Program impacted: BIND 9 Versions affected: BIND 9.20.0 -> 9.20.20 9.21.0 -> 9.21.19 BIND Supported Preview Edition 9.20.9-S1 -> 9.20.20-S1 Versions NOT affected: BIND 9.18.0 -> 9.18.46 BIND Supported Preview Edition 9.18.11-S1 -> 9.18.46-S1 Severity: High Exploitable: Remotely Description: A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. Impact: If a BIND resolver is asked to query a specially crafted domain, memory will not be recovered by named. This can cause unbounded growth of Resident Set Size (RSS) memory, which may lead to an out-of-memory condition. Additionally, named will exit with an assertion failure if a shutdown or reload is attempted. Authoritative services are believed to be unaffected by this vulnerability but it is important to read: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries Resolvers are affected by this vulnerability. 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: 9.20.21 9.21.20 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.21-S1 Acknowledgments: ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 18 March 2026 2.0 Public disclosure, 25 March 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 mailed to bind-security@isc.org or 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-2026-3104 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-2026-3119: Authenticated query containing a TKEY record may cause named to terminate unexpectedly Published on Mar 25, 2026 Darren Ankney CVE: CVE-2026-3119 Title: Authenticated query containing a TKEY record may cause named to terminate unexpectedly Document version: 2.0 Posting date: 25 March 2026 Program impacted: BIND 9 Versions affected: BIND 9.20.0 -> 9.20.20 9.21.0 -> 9.21.19 BIND Supported Preview Edition 9.20.9-S1 -> 9.20.20-S1 Versions NOT affected: BIND 9.18.0 -> 9.18.46 BIND Supported Preview Edition 9.18.11-S1 -> 9.18.46-S1 Severity: Medium Exploitable: Remotely Description: Under certain conditions, named may crash when processing a correctly signed query containing a TKEY record. The affected code can only be reached if an incoming request has a valid transaction signature (TSIG) from a key declared in the named configuration. Impact: If this situation is encountered, named will terminate unexpectedly. Authoritative servers are affected by this vulnerability. Resolvers are affected by this vulnerability. CVSS Score: 6.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:N/S:U/C:N/I:N/A:H&version=3.1. Workarounds: Remove any TSIG keys that might be used by an attacker. 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: 9.20.21 9.21.20 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.21-S1 Acknowledgments: ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 18 March 2026 2.0 Public disclosure, 25 March 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 mailed to bind-security@isc.org or 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-2026-3119 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-2026-3591: A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass Published on Mar 25, 2026 Darren Ankney CVE: CVE-2026-3591 Title: A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass Document version: 2.0 Posting date: 25 March 2026 Program impacted: BIND 9 Versions affected: BIND 9.20.0 -> 9.20.20 9.21.0 -> 9.21.19 BIND Supported Preview Edition 9.20.9-S1 -> 9.20.20-S1 Versions NOT affected: BIND 9.18.0 -> 9.18.46 BIND Supported Preview Edition 9.18.11-S1 -> 9.18.46-S1 Severity: Medium Exploitable: Remotely Description: A use-after-return vulnerability exists in the named server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. Impact: An attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Authoritative servers are affected by this vulnerability. Resolvers are affected by this vulnerability. CVSS Score: 5.4 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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:L/UI:N/S:U/C:L/I:L/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: 9.20.21 9.21.20 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.21-S1 Acknowledgments: ISC would like to thank Mcsky23 for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 18 March 2026 2.0 Public disclosure, 25 March 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 mailed to bind-security@isc.org or 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-2026-3591 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. ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 23/25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email:cert@support.renater.fr + =========================================================