{"id":"CVE-2025-40777","details":"If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through 9.21.9, and 9.20.9-S1 through 9.20.10-S1.","modified":"2026-04-10T05:26:25.711189Z","published":"2025-07-16T18:15:24Z","related":["CGA-m3r3-pggv-4xpq","SUSE-SU-2025:02349-1","openSUSE-SU-2025:15354-1"],"references":[{"type":"WEB","url":"https://kb.isc.org/docs/cve-2025-40777"}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}