High [CVE-2026-12617] Record ordering based unexpected exit with CNAME or DNAME
This high-severity Red Hat Linux advisory covers CVE-2026-12617 affecting Red Hat Hardened Images.
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Summary
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.
This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. This Important flaw in BIND can lead to a denial of service in Red Hat products.
The `named` daemon may terminate unexpectedly when processing specific CNAME/DNAME and A record query orderings, coupled with precisely timed authoritative server responses. Exploitation requires an attacker to manipulate DNS responses from an authoritative server to a vulnerable resolver.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-617.
Affected Red Hat products: Red Hat Hardened Images. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4 as not affected.
Red Hat fixing advisory: RHSA-2026:54071.
- 9.18.0
- 9.18.50
- 9.20.0
- 9.20.24
- 9.18.11
- 9.20.9
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
- bind-main-9.20.26-0.1.hum1
- RHSA-2026:54071
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
Mitigation
Upgrade to a fixed release: bind-main-9.20.26-0.1.hum1, RHSA-2026:54071. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
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