Use After Free in C-ares
CVE-2025-62408
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.
Vulnerability class: Use-After-Free
EPSS: 0.004 (30.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- C-ares — versions > 1.32.3, < 1.34.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-62408?
- CVE-2025-62408 is a medium-severity vulnerability in C-ares, classified under Use After Free. CVSS score: 5.9/10. Published 2025-12-08.
- How severe is CVE-2025-62408?
- Medium severity. CVSS v3 base score is 5.9 out of 10.