CVE-2022-4904

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-03-06 · updated 2026-06-17
Weakness: CWE-20

Description

A flaw was found in the c-ares package. The ares_set_sortlist is missing checks about the validity of the input string, which allows a possible arbitrary length stack overflow. This issue may cause a denial of service or a limited impact on confidentiality and integrity.

Affected products

C-Ares Project C-Ares: before 1.19.0 — fixed in 1.19.0
Fedoraproject Fedora: 36
Red Hat Enterprise Linux: 8.0, 9.0
RedHat Software Collections: all versions

How to fix

Upgrade to a fixed version: C-Ares Project C-Ares 1.19.0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=2168631
https://github.com/c-ares/c-ares/issues/496
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33LDNS6RPOPP36Z4MPWXALUQZXJCWJS2/
https://security.gentoo.org/glsa/202401-02
https://bugzilla.redhat.com/show_bug.cgi?id=2168631
https://github.com/c-ares/c-ares/issues/496
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33LDNS6RPOPP36Z4MPWXALUQZXJCWJS2/
https://security.gentoo.org/glsa/202401-02

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