RHSA-2026:55437: Important: bind security update

Published Aug 17, 2026
·
Updated

The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.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

46 affected componentsFixes available
redhat/bind<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-chroot<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-debugsource<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-dnssec-utils<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-dnssec-utils-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-libs<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-libs-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-license<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-utils<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-utils-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-chroot<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-debugsource<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-dnssec-utils<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-dnssec-utils-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-libs<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-libs-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-utils<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-utils-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-chroot<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-debugsource<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-dnssec-utils<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-dnssec-utils-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-libs<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-libs-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-utils<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-utils-debuginfo<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-chroot<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-debuginfo<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-debugsource<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-dnssec-utils<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-dnssec-utils-debuginfo<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-libs<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-libs-debuginfo<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-utils<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-utils-debuginfo<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-devel<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-doc<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-devel<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10
redhat/bind-devel<9.18.33-15.el10_2.10.aa
9.18.33-15.el10_2.10.aa
redhat/bind-devel<9.18.33-15.el10_2.10
9.18.33-15.el10_2.10

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 9.18.33-15.el10_2.10
  2. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  3. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  4. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  5. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  6. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  7. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  8. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  9. Upgrade

    Upgrade redhat/bind-license to a version that resolves this vulnerability.

    Fixed in 9.18.33-15.el10_2.10
  10. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  11. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  12. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 9.18.33-15.el10_2.10.aa
  13. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  14. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  15. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  16. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  17. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  18. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  19. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  20. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  21. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa
  22. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  23. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10
  24. Upgrade

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

    Fixed in 9.18.33-15.el10_2.10.aa

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-2026:55437?

The severity of RHSA-2026:55437 is rated as 65, indicating a significant security risk.

2

How do I fix RHSA-2026:55437?

To fix RHSA-2026:55437, you should update your BIND packages to the latest versions provided by Red Hat.

3

What vulnerabilities are addressed in RHSA-2026:55437?

RHSA-2026:55437 addresses multiple vulnerabilities in BIND that could lead to denial of service or remote code execution.

4

Which software is affected by RHSA-2026:55437?

The affected software includes redhat/bind and its associated packages such as redhat/bind-chroot and redhat/bind-libs.

5

When was RHSA-2026:55437 published?

RHSA-2026:55437 was published on August 17, 2026.

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