Bug 2381418 (CVE-2025-40777) - CVE-2025-40777 bind: bind assertion failure
Summary: CVE-2025-40777 bind: bind assertion failure
Keywords:
Status: NEW
Alias: CVE-2025-40777
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2381492 2381493 2381494 2381495
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-16 18:01 UTC by OSIDB Bzimport
Modified: 2025-07-23 02:37 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-07-16 18:01:19 UTC 
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.
This 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.
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