CVE-2025-62408

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

Published Dec 8, 2025 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DSA Debian DSA DSA-6084-1 c-ares security update
Ubuntu USN Ubuntu USN USN-7925-1 c-ares vulnerability
History
Type Values Removed Values Added
CPEs cpe:2.3:a:c-ares:c-ares:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared C-ares
C-ares c-ares
Vendors & Products C-ares
C-ares c-ares
Type Values Removed Values Added
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.
Title c-ares has a Use After Free vulnerability when connection is cleaned up after error
Weaknesses CWE-416
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 9, 2025, 4:05 PM
Reserved
Oct 13, 2025, 4:26 PM
Status
Analyzed
Published
Dec 8, 2025, 10:15 PM
Modified
Oct 14, 2026, 10:10 PM
Severity
Moderate
Public date
Dec 8, 2025, 10:04 PM