CVE-2025-62408: c-ares Use After Free
CVSS: 5.9v3.1MediumAnalyzed
AliasesALPINE-CVE-2025-62408RHSA-2026:7414UBUNTU-CVE-2025-62408USN-7925-1DEBIAN-CVE-2025-62408DSA-6084-1openSUSE-SU-2026:10007-1openSUSE-SU-2026:10029-1
Published 08-12-2025Last modified 09-12-2025
Vulnerability summary
CVE-2025-62408 is a medium (CVSS 5.9) Use After Free vulnerability in c-ares. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.6% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)EPSS score
0.43%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 08-12-2025PublishedVulnerability first disclosed.
- 09-12-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 6 sources · 1 versionMedium 5.9Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 6 agree
- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · Red hatEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.43%
Chance of exploitation in the next 30 days
Percentile
36%
Versus all other CVEs
30-day change
0.00 pp
From 0.43% on 20-09-2026
20-09-202620-10-2026
EPSS score0.43%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Opensuse2 products
- c-ares&distro=openSUSE Tumbleweed< 1.34.6-1.1
- istioctl&distro=openSUSE Tumbleweed< 1.28.2-1.1
Redhat2 products
- c-ares< 0:1.34.6-3.1.hum1
- c-ares-devel< 0:1.34.6-3.1.hum1
Alpine1 product
- c-ares≥ 1.32.3, < 1.34.6-r0
C-ares1 product
- c-ares> 1.32.3, < 1.34.6 | ≥ 1.32.3, < 1.34.6
Debian1 product
- c-ares< 1.34.5-1+deb13u1 | < 1.34.6-1
Ubuntu1 product
- c-ares< 1.34.5-1ubuntu0.1
6 vendors · 8 products
References
15 links- github.com/c-ares/c-ares/security/advisories/GHSA-jq53-42q6-pqr5X Refsource CONFIRMARTICLEREPORTPatchVendor Advisory
- github.com/c-ares/c-ares/commit/714bf5675c541bd1e668a8db8e67ce012651e618X Refsource MISCARTICLEPatch
- images.redhat.comARTICLE
