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Fencer Intel
medium 5.9

CVE-2025-62408 json

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

published 11mo ago modified 26d ago also EUVD-2025-201830

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Patch / fix

  • c-ares c-ares 1.34.6
  • c-ares Debian 13 1.34.5-1+deb13u1
  • c-ares Debian 14 1.34.6-1

debian advisories DEBIAN-CVE-2025-62408

  • c-ares Ubuntu 25.10 1.34.5-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2025-62408

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • c-ares hummingbird 1 1.34.6-3.1.hum1

red hat advisories RHSA-2026:7414

  • nodejs18 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 18.20.8-150400.9.39.1
  • c-ares SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 1.34.8-150000.3.29.1
  • c-ares Linux Micro 6.1 1.34.8-slfo.1.1_1.1
  • c-ares Linux Micro 6.0 1.34.8-1.1
  • nodejs18 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 18.20.8-8.44.1

suse advisories SUSE-SU-2026:4261-1SUSE-SU-2026:4248-1SUSE-SU-2026:4021-1SUSE-SU-2026:23414-1SUSE-SU-2026:23364-1

  • istioctl openSUSE Tumbleweed 1.28.2-1.1
  • c-ares openSUSE Tumbleweed 1.34.6-1.1

opensuse advisories openSUSE-SU-2026:10029-1openSUSE-SU-2026:10007-1

  • c-ares Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 1.34.6-r0

alpine advisories ALPINE-CVE-2025-62408

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • fluent-bit Azure Linux 3.0 3.1.10-4

azure linux advisories AZL-71854

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2025-62408 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-62408 updated cvss 5.9

c-ares: c-ares: Denial of Service due to query termination after maximum attempts

  • Red Hat Enterprise Linux 6 c-ares Red Hat Enterprise Linux 7 c-ares
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 npm, c-ares, nodejs, nodejs-libs, nodejs-nodemon, nodejs-full-i18n, +2 more Red Hat Enterprise Linux 9 npm, c-ares, nodejs, nodejs-libs, nodejs-full-i18n Red Hat Enterprise Linux 10 c-ares, nodejs22, nodejs24 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images c-ares 1.34.6-3.1.hum1
    fixed: vendor fix RHSA-2026:7414

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
11mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • c-ares c-ares

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.