RHSA-2026:99168: Important: c-ares security update

Published Nov 11, 2026
·
Updated

The c-ares C library defines asynchronous DNS (Domain Name System) requests and provides name resolving API.Security Fix(es): c-ares: c-ares: Denial of Service via unvalidated DNS header record counts (CVE-2026-69186) c-ares: c-ares: CPU exhaustion denial of service via unbounded DNS name compression pointer chains (CVE-2026-69184) 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.

Affected Software

16 affected componentsFixes available
redhat/c-ares<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-debuginfo<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-debugsource<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-devel<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-debuginfo<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-debugsource<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-devel<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-debuginfo<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-debugsource<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares-devel<1.34.6-2.el10_2.2
1.34.6-2.el10_2.2
redhat/c-ares<1.34.6-2.el10_2.2.aa
1.34.6-2.el10_2.2.aa
redhat/c-ares-debuginfo<1.34.6-2.el10_2.2.aa
1.34.6-2.el10_2.2.aa
redhat/c-ares-debugsource<1.34.6-2.el10_2.2.aa
1.34.6-2.el10_2.2.aa
redhat/c-ares-devel<1.34.6-2.el10_2.2.aa
1.34.6-2.el10_2.2.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/c-ares to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2
  2. Upgrade

    Upgrade redhat/c-ares-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2
  3. Upgrade

    Upgrade redhat/c-ares-debugsource to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2
  4. Upgrade

    Upgrade redhat/c-ares-devel to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2
  5. Upgrade

    Upgrade redhat/c-ares to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2.aa
  6. Upgrade

    Upgrade redhat/c-ares-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2.aa
  7. Upgrade

    Upgrade redhat/c-ares-debugsource to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2.aa
  8. Upgrade

    Upgrade redhat/c-ares-devel to a version that resolves this vulnerability.

    Fixed in 1.34.6-2.el10_2.2.aa

Event History

Nov 11, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software

Company

Resources

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