Skip to content
OpenAdvisories
High RHSA-2026:40574 2 CVEs

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Published Sep 26, 2026 · Updated Oct 17, 2026

Ecosystem: Red Hat

Fixed packages 2

ReleasePackageFixed in
Red Hat · Hardened Images 1 hummingbird:1 c-ares 0:1.34.8-2.hum1
Red Hat · Hardened Images 1 hummingbird:1 c-ares-devel 0:1.34.8-2.hum1

Vulnerabilities 2

  • High 7.5
    CVE-2026-69184

    c-ares: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains

    c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long desc…

    c-ares c-ares fluent-bit c-ares Debian Ubuntu Azure Linux
  • Medium 5.3
    CVE-2026-69186

    c-ares: Memory-amplification denial of service via unvalidated DNS header record counts

    c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() i…

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

References

  • article
    https://images.redhat.com/
  • report
    https://access.redhat.com/security/cve/CVE-2026-69186
  • article
    https://access.redhat.com/security/updates/classification/
  • report
    https://access.redhat.com/security/cve/CVE-2026-69184
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_40574.json
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2538396
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-69184
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-69184
  • article
    https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b
  • article
    https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea
  • article
    https://github.com/c-ares/c-ares/pull/1164
  • article
    https://github.com/c-ares/c-ares/pull/1210
  • article
    https://github.com/c-ares/c-ares/releases/tag/v1.34.7
  • article
    https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2538212
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-69186
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-69186
  • article
    https://github.com/c-ares/c-ares/commit/e47c203f91cd8b749c8736bc18d75a31ffdec8f4
  • article
    https://github.com/c-ares/c-ares/commit/eaded4cb200b2a5f8d73f11021ff7c8d6968aaab
  • article
    https://github.com/c-ares/c-ares/pull/1134
  • article
    https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj