RHSA-2026:95477 - Security Advisory

Topic

An update for bind is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 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)
• bind: BIND: Denial of Service via specially crafted DNS messages (CVE-2026-5946)
• 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)
• bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling (CVE-2026-19667)
• bind: BIND: Denial of Service via crafted DNSSEC reply (CVE-2026-80274)
• bind: BIND: Denial of Service via malformed DNS64 responses (CVE-2026-19666)
• bind: BIND: Denial of Service via unbounded processing of crafted DNS messages (CVE-2026-19630)
• bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay (CVE-2026-94300)

Bug Fix(es) and Enhancement(s):

• bind: New root trust anchor key for DNSSEC (JIRA:RHEL-265349)
• random named crashes on different RHEL 8.10 resolvers after of installing bind-9.11.36-16.el8_10.14 (RHSA-2026:54654) (JIRA:RHEL-300943)

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 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2479767 - CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
• BZ - 2479771 - CVE-2026-5946 bind: BIND: Denial of Service via specially crafted DNS messages
• 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
• BZ - 2535435 - CVE-2026-19667 bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling
• BZ - 2535466 - CVE-2026-80274 bind: BIND: Denial of Service via crafted DNSSEC reply
• BZ - 2535477 - CVE-2026-19666 bind: BIND: Denial of Service via malformed DNS64 responses
• BZ - 2556406 - CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
• BZ - 2556407 - CVE-2026-94300 bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay

CVEs

• CVE-2026-3039
• CVE-2026-5946
• CVE-2026-10723
• CVE-2026-11622
• CVE-2026-11721
• CVE-2026-13204
• CVE-2026-13321
• CVE-2026-19630
• CVE-2026-19666
• CVE-2026-19667
• CVE-2026-80274
• CVE-2026-94300

References

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