RHSA-2026:80501 - Security Advisory

Topic

An update for bind9.16 is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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):

• bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation (CVE-2026-3039)
• 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)

Bug Fix(es) and Enhancement(s):

• bind9.16: New root trust anchor key for DNSSEC (JIRA:RHEL-272313)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64

Fixes

• BZ - 2479767 - CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
• BZ - 2503721 - CVE-2026-11331 bind9: bind: Potential wildcard CNAME RPZ policy bypass
• BZ - 2504166 - CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
• BZ - 2504298 - CVE-2026-11622 bind: bind9: Potential memory usage beyond configured limits
• BZ - 2504338 - CVE-2026-11721 bind: bind9: Cache poisoning via label count discrepancy, RRSIG, wildcards
• BZ - 2504447 - CVE-2026-13204 bind: bind9: Unexpected exit with NSEC and NSEC3 both present
• BZ - 2504560 - CVE-2026-10723 bind: bind9: Incorrect acceptance of NSEC3 records

CVEs

• CVE-2026-3039
• CVE-2026-10723
• CVE-2026-11331
• CVE-2026-11622
• CVE-2026-11721
• CVE-2026-13204
• CVE-2026-13321

References

• https://access.redhat.com/security/updates/classification/#important