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OpenAdvisories
High RHSA-2026:42096 1 CVE

Red Hat Security Advisory: c-ares security update

Published Jul 23, 2026 · Updated Sep 4, 2026

Ecosystem: Red Hat

Fixed packages 4

ReleasePackageFixed in
Red Hat · RHEL 10 enterprise_linux:10.2 c-ares 0:1.34.6-2.el10_2
Red Hat · RHEL 10 enterprise_linux:10.2 c-ares-debuginfo 0:1.34.6-2.el10_2
Red Hat · RHEL 10 enterprise_linux:10.2 c-ares-debugsource 0:1.34.6-2.el10_2
Red Hat · RHEL 10 enterprise_linux:10.2 c-ares-devel 0:1.34.6-2.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

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2497686
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_42096.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-33630
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-33630
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-33630
  • article
    https://github.com/c-ares/c-ares/commit/1fa3b86a0b8d18fe7b60f3228a01d770feb026bc
  • article
    https://github.com/c-ares/c-ares/commit/d823199b688052dcdc1646f2ab4cb8c16b1c644a