CVE-2025-62408

c-ares has a Use After Free vulnerability when connection is cleaned up after error

State: Published
Severity: 5.9 Medium
Published: Dec 8, 2025
Updated: Dec 9, 2025
Reserved: Oct 13, 2025

Description

c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using read_answer() and process_answer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
c-aresc-ares	> 1.32.3, < 1.34.6Affected

References

https://github.com/c-ares/c-ares/security/advisories/GHSA-jq53-42q6-pqr5
https://github.com/c-ares/c-ares/commit/714bf5675c541bd1e668a8db8e67ce012651e618

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