RHSA-2026:97585 - Security Advisory

Topic

An update for bind9.18 is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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

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):

• bind: Amplification vulnerabilities via self-pointed glue records (CVE-2026-3592)
• bind: Unbounded resend loop in BIND 9 resolver (CVE-2026-5950)

Bug Fix(es) and Enhancement(s):

• Bind 9.18.29 DNSSEC Key Rollover with KASP Causes ZSK Key To Be Removed Prematurely (JIRA:RHEL-144422)
• [BUG] Bind DNS forwarder when configured to allow stale answers fails to provide resonse of 3 layer CNAME when TTL abruptly changes to 0 (JIRA:RHEL-86172)
• bind9.18: New root trust anchor key for DNSSEC [rhel-9.9] (JIRA:RHEL-255678)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from 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 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for x86_64 9 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 9 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 9 s390x

Fixes

• BZ - 2479768 - CVE-2026-3592 bind: Amplification vulnerabilities via self-pointed glue records
• BZ - 2479773 - CVE-2026-5950 bind: Unbounded resend loop in BIND 9 resolver
• RHEL-86172 - [BUG] Bind DNS forwarder when configured to allow stale answers fails to provide resonse of 3 layer CNAME when TTL abruptly changes to 0

CVEs

• CVE-2026-3592
• CVE-2026-5950

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/9.9_release_notes/index