CVE-2025-62408 MEDIUM

CVE-2025-62408: c-ares has a Use After Free vulnerability when connection is cleaned up after error

Vendor C-Ares
Product c-ares
Weakness CWE-416
Published December 8, 2025
Last update December 9, 2025
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 8, 2025 CVE published
December 9, 2025 Record updated