RHSA-2026:55442: Important: bind9.18 security update

Published Aug 17, 2026
·
Updated

BIND (Berkeley Internet Name Domain) is an implementation of the DNS (Domain Name System) protocols. BIND includes a DNS server (named), which resolves host names to IP addresses; a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating properly.Security Fix(es): bind9: bind: Potential wildcard CNAME RPZ policy bypass (CVE-2026-11331) bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field (CVE-2026-13321) bind: bind9: Potential memory usage beyond configured limits (CVE-2026-11622) bind: bind9: Cache poisoning via label count discrepancy, RRSIG, wildcards (CVE-2026-11721) bind: bind9: Unexpected exit with NSEC and NSEC3 both present (CVE-2026-13204) bind: bind9: Incorrect acceptance of NSEC3 records (CVE-2026-10723) 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

45 affected componentsFixes available
redhat/bind9.18<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-chroot<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-debugsource<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-dnssec-utils<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-dnssec-utils-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-libs<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-libs-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-utils<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-utils-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-chroot<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-debugsource<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-dnssec-utils<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-dnssec-utils-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-libs<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-libs-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-utils<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-utils-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-chroot<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-debugsource<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-dnssec-utils<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-dnssec-utils-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-libs<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-libs-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-utils<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-utils-debuginfo<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-chroot<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-debuginfo<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-debugsource<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-dnssec-utils<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-dnssec-utils-debuginfo<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-libs<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-libs-debuginfo<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-utils<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-utils-debuginfo<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa
redhat/bind9.18-devel<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-devel<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-doc<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-devel<9.18.29-14.el9_8.8
9.18.29-14.el9_8.8
redhat/bind9.18-devel<9.18.29-14.el9_8.8.aa
9.18.29-14.el9_8.8.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/bind9.18 to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  2. Upgrade

    Upgrade redhat/bind9.18-chroot to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  3. Upgrade

    Upgrade redhat/bind9.18-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  4. Upgrade

    Upgrade redhat/bind9.18-debugsource to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  5. Upgrade

    Upgrade redhat/bind9.18-dnssec-utils to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  6. Upgrade

    Upgrade redhat/bind9.18-dnssec-utils-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  7. Upgrade

    Upgrade redhat/bind9.18-libs to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  8. Upgrade

    Upgrade redhat/bind9.18-libs-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  9. Upgrade

    Upgrade redhat/bind9.18-utils to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  10. Upgrade

    Upgrade redhat/bind9.18-utils-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  11. Upgrade

    Upgrade redhat/bind9.18 to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  12. Upgrade

    Upgrade redhat/bind9.18-chroot to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  13. Upgrade

    Upgrade redhat/bind9.18-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  14. Upgrade

    Upgrade redhat/bind9.18-debugsource to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  15. Upgrade

    Upgrade redhat/bind9.18-dnssec-utils to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  16. Upgrade

    Upgrade redhat/bind9.18-dnssec-utils-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  17. Upgrade

    Upgrade redhat/bind9.18-libs to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  18. Upgrade

    Upgrade redhat/bind9.18-libs-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  19. Upgrade

    Upgrade redhat/bind9.18-utils to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  20. Upgrade

    Upgrade redhat/bind9.18-utils-debuginfo to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  21. Upgrade

    Upgrade redhat/bind9.18-devel to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  22. Upgrade

    Upgrade redhat/bind9.18-doc to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8
  23. Upgrade

    Upgrade redhat/bind9.18-devel to a version that resolves this vulnerability.

    Fixed in 9.18.29-14.el9_8.8.aa
  24. Upgrade

    Upgrade bind9 to a version that resolves this vulnerability.

    Fixed in bind9.18
  25. Compensating control

    Given this is a bind9.18 security update addressing multiple bind9 security issues (e.g., CVE-2026-11721, CVE-2026-13321, CVE-2026-10723, CVE-2026-11622, CVE-2026-13204, CVE-2026-11331), ensure the DNS server (named) is protected during patching by temporarily restricting/monitoring DNS query traffic to the server and validating service health after the update.

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of RHSA-2026:55442?

The severity of RHSA-2026:55442 is classified as important.

2

How do I fix RHSA-2026:55442?

To fix RHSA-2026:55442, you should update the BIND packages to the latest version provided by Red Hat.

3

What systems are affected by RHSA-2026:55442?

RHSA-2026:55442 affects systems using the BIND 9.18 implementation on Red Hat.

4

What vulnerabilities are addressed in RHSA-2026:55442?

RHSA-2026:55442 addresses multiple vulnerabilities related to the BIND DNS server.

5

What components are included in the BIND 9.18 update for RHSA-2026:55442?

The BIND 9.18 update for RHSA-2026:55442 includes various components such as the DNS server, resolver library, and DNSSEC utilities.

Company

Resources

Contact

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