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High ALSA-2026:75767 3 CVEs

Important: bind security update

Published Oct 5, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

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: 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)

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.

Fixed packages 10

ReleasePackageFixed in
AlmaLinux · 9 bind 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-chroot 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-devel 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-dnssec-doc 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-dnssec-utils 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-doc 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-libs 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-license 32:9.16.23-40.el9_8.10
AlmaLinux · 9 bind-utils 32:9.16.23-40.el9_8.10
AlmaLinux · 9 python3-bind 32:9.16.23-40.el9_8.10

Vulnerabilities 3

  • High 7.5
    CVE-2026-19666

    Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path

    On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.2…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2026-19667

    Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`

    If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in `named` results in a negative cache entry of 0 bytes. When this entry is subsequently read, `named` aborts. This issue affects BIND 9 vers…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2026-80274

    Validating resolver can abort while caching a mismatched NOQNAME proof

    If a BIND resolver sends a query for a DNSSEC-signed authoritative zone, and the authoritative server replies with a valid wildcard answer and signed NSEC3 proof, followed by an unsigned NSEC at the same owner name, it will trigger an unexpected program exit.…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-19666
  • report
    https://access.redhat.com/security/cve/CVE-2026-19667
  • report
    https://access.redhat.com/security/cve/CVE-2026-80274
  • report
    https://bugzilla.redhat.com/2535435
  • report
    https://bugzilla.redhat.com/2535466
  • report
    https://bugzilla.redhat.com/2535477
  • advisory
    https://errata.almalinux.org/9/ALSA-2026-75767.html