7.5

CVE-2026-12617

Record ordering based unexpected exit with CNAME or DNAME

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.
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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerISC
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Produkt BIND 9
Default Statusunaffected
Version <= 9.18.50
Version 9.18.0
Status affected
Version <= 9.20.24
Version 9.20.0
Status affected
Version <= 9.18.50-S1
Version 9.18.11-S1
Status affected
Version <= 9.20.24-S1
Version 9.20.9-S1
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.49% 0.392
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
ISC 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-617 Reachable Assertion

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

https://downloads.isc.org/isc/bind9/9.20.26
https://kb.isc.org/docs/cve-2026-12617