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bind9

Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`.
This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

CVE-2026-5946 is an important denial of service vulnerability in the named daemon of ISC BIND 9. It arises from improper input validation (CWE-20, CWE-1287) when processing DNS messages that use classes other than Internet (IN), such as CHAOS or HESIOD, or meta-classes like ANY or NONE. These specially crafted DNS messages targeting recursion, dynamic updates, zone notifications, or IN-specific record processing in non-IN data can trigger assertion failures causing the named daemon to crash. The vulnerability affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and their S1 variants. Red Hat has issued security advisories and released patches for affected products including Red Hat Enterprise Linux 10. The CVSS v3.1 base score is 7.5 (high severity) with network attack vector, low complexity, no privileges or user interaction required, and high availability impact. No known active exploits have been reported. Mitigations other than patching are limited or do not meet vendor criteria.

Detailed information about CVE-2026-5946: CWE-20 Improper Input Validation in ISC BIND 9 affecting ISC BIND 9. Get real-time updates, technical details, and mit

CVE-2026-5946: CWE-20 Improper Input Validation in ISC BIND 9 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-5946: CWE-20 Improper Input Validation in ISC BIND 9

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