Fedora 43 bind9-next Critical DNS Fix CVE-2026-1519 DoS 2026-a6efefa854
fedora
April 3, 2026
Update to 9.21.20 (rhbz#2440560) Security Fixes: Fix unbounded NSEC3 iterations when validating referrals to unsigned delegations
Summary
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.
Update Information:
Update to 9.21.20 (rhbz#2440560) Security Fixes: Fix unbounded NSEC3 iterations when validating referrals to unsigned delegations. (CVE-2026-1519) Fix memory leaks in code preparing DNSSEC proofs of non-existence. (CVE-2026-3104) Prevent a crash in code processing queries containing a TKEY record. (CVE-2026-3119) Fix a stack use-after-return flaw in SIG(0) handling code. (CVE-2026-3591) New Features: Provide response round-trip time (RTT) counters via statistics channel. Introduce max-delegation-servers configuration option. Bug Fixes: Fix parsing key inactivation time in KASP code. Fix the handling of key statements defined inside views. Update to 9.21.19 Security Fixes: Fix a use-after-free error in dns_client_resolve() triggered by a DNAME response. Fix a NULL pointer dereference in qp-trie cache code. Immediately remove purged ADB names and entries from the SIEVE list. Feature Changes: Record query time for all dnstap responses. Optimize TCP source port selection on Linux. and m...
Topics Covered
Change Log
* Wed Mar 25 2026 Petr Men\u0161k
References
[ 1 ] Bug #2440560 - bind9-next-9.21.20 is available
https://bugzilla.redhat.com/show_bug.cgi?id=2440560
[ 2 ] Bug #2451573 - CVE-2026-3591 bind9-next: BIND: Unauthorized access due to use-after-return vulnerability in DNS query handling [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2451573
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-a6efefa854' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Name: bind9-next
Product: Fedora 43
Version: 9.21.20
Release: 1.fc43
Summary: The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) server
Topics Covered
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