RHSA-2026:75578 — Security Advisory

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 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.

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: BIND 9: Remote Denial of Service via cached SVCB/HTTPS AliasMode records (CVE-2026-81736)

• bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling (CVE-2026-19667)

• bind: BIND resolver: Denial of Service due to resource exhaustion in SVCB/HTTPS AliasMode processing (CVE-2026-81563)

• bind: BIND: Denial of Service via crafted DNSSEC reply (CVE-2026-80274)

• bind: BIND: Denial of Service via malformed DNS64 responses (CVE-2026-19666)

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.