Ce mail provient de l'extérieur, restons vigilants ===================================================================== CERT-Renater Note d'Information No. 2026/VULN1073 _____________________________________________________________________ DATE : 26/10/2026 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running ISC BIND versions prior to 9.20.30, 9.21.27. ==================================================================== https://kb.isc.org/docs/cve-2026-94300 https://kb.isc.org/docs/cve-2026-96888 https://kb.isc.org/docs/cve-2026-97313 https://kb.isc.org/docs/cve-2026-19630 _____________________________________________________________________ CVE-2026-94300: Concurrent GSS-TSIG messages corrupt memory Published on Oct 21, 2026 CVE-2026-94300: Concurrent GSS-TSIG messages corrupt memory CVE: CVE-2026-94300 Title: Concurrent GSS-TSIG messages corrupt memory Document version: 2.0 Posting date: 21 October 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.18.50 9.20.0 -> 9.20.29 9.21.0 -> 9.21.26 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.29-S1 Severity: High Exploitable: Remotely Description: Replaying GSS-TSIG signed UDP messages can result in memory corruption in "named". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. Impact: Memory corruption, leading to program abort and/or potential remote code execution. CVSS Score: 8.1 CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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:H/PR:N/UI:N/S:U/C:H/I:H/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: 9.20.30 9.21.27 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.30-S1 Acknowledgments: While this flaw was discovered in internal testing, ISC would like to thank Dave Aitel from OpenAI who independently discovered and responsibly reported the issue to ISC. Document revision history: 1.0 Early Notification, 14 October 2026 2.0 Public disclosure, 21 October 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-2026-94300 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-2026-96888: named may terminate unexpectedly when a redirect zone is used with strict QNAME minimization Published on Oct 21, 2026 CVE-2026-96888: named may terminate unexpectedly when a redirect zone is used with strict QNAME minimization CVE: CVE-2026-96888 Title: Named may terminate unexpectedly when a redirect zone is used with strict QNAME minimization Document version: 2.0 Posting date: 21 October 2026 Program impacted: BIND 9 Versions affected: BIND 9.16.0 -> 9.18.50 9.20.0 -> 9.20.29 9.21.0 -> 9.21.26 BIND Supported Preview Edition 9.16.8-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.29-S1 Severity: High Exploitable: Remotely Description: A BIND resolver that is configured with both a "redirect" zone and "qname-minimization strict" may abort with an assertion failure while processing the redirect. Impact: Program abort and exit, potentially leading to denial-of-service. 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: 9.20.30 9.21.27 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.30-S1 Acknowledgments: ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 14 October 2026 2.0 Public disclosure, 21 October 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-2026-96888 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-2026-97313 Title: Specific RPZ configurations and query patterns may result in an unexpected exit Document version: 2.0 Posting date: 21 October 2026 Program impacted: BIND 9 Versions affected: BIND 9.16.0 -> 9.18.50 9.20.0 -> 9.20.29 9.21.0 -> 9.21.26 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.29-S1 Severity: High Exploitable: Remotely Description: A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of "recursive-only yes", and the other with "recursive-only no". Impact: Unexpected exit and a denial of service. 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: 9.20.30 9.21.27 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.30-S1 Acknowledgments: ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 14 October 2026 2.0 Public disclosure, 21 October 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-2026-97313 is thec omplete 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-2026-19630 Title: Amplified resource exhaustion in inbound message processing Document version: 2.0 Posting date: 21 October 2026 Program impacted: BIND 9 Versions affected: BIND 9.11.0 -> 9.18.50 9.20.0 -> 9.20.29 9.21.0 -> 9.21.26 BIND Supported Preview Edition 9.11.3-S1 -> 9.18.50-S1 9.20.9-S1 -> 9.20.29-S1 Severity: High Exploitable: Remotely Description: In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND. A DNS message with a maliciously large number of such structures will cause BIND to consume disproportionate amounts of CPU time and memory during processing. Impact: Potential CPU and/or memory exhaustion leading to denial-of-service. 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: 9.20.30 9.21.27 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.20.30-S1 Document revision history: 1.0 Early Notification, 14 October 2026 2.0 Public disclosure, 21 October 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-2026-19630 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 + =========================================================