Skip to content
OpenAdvisories
High ALSA-2026:42096 1 CVE

Important: c-ares security update

Published Jul 20, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The c-ares C library defines asynchronous DNS (Domain Name System) requests and provides name resolving API.

Security Fix(es):

* c-ares: c-ares: Use-after-free / double-free in query-completion handling (CVE-2026-33630)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 2

ReleasePackageFixed in
AlmaLinux · 10 c-ares 1.34.6-2.el10_2
AlmaLinux · 10 c-ares-devel 1.34.6-2.el10_2

Vulnerabilities 1

  • High 7.5
    CVE-2026-33630

    c-ares : Use-after-free / double-free in c-ares query-completion handling, remotely triggerable via ares_getaddrinfo() over TCP

    c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup st…

    c-ares c-ares nodejs fluent-bit Debian Ubuntu Azure Linux Alpine

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-33630
  • report
    https://bugzilla.redhat.com/2497686
  • advisory
    https://errata.almalinux.org/10/ALSA-2026-42096.html