Resource exhaustion in ISC BIND - CVE-2026-19668

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Main Vulnerability Database Vulnerabilities #VU150231

Resource exhaustion in ISC BIND - CVE-2026-19668

Published: September 16, 2026


Vulnerability identifier: #VU150231
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-19668
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the BIND recursive resolver when processing large numbers of invalid DNSSEC records. A remote attacker can cause the resolver to process excessive invalid DNSSEC cryptographic material to cause a denial of service.


Affected software

ISC BIND
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
Debian Linux
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
Ubuntu
Basesystem Module
Server Applications Module
openSUSE Leap
openEuler
Fedora
bind9 (Ubuntu package)
bind-utils-debuginfo
bind-utils
bind
bind-debuginfo
bind-debugsource
bind-doc
python3-bind
bind-dnssec-doc
bind-license
bind-libs
bind-dnssec-utils
bind-devel
bind-chroot
bind9-next
bind-dyndb-ldap
bind9 (Debian package)

How to mitigate CVE-2026-19668

Install security update from vendor's website.

ISC BIND - addressed in versions 9.20.29, 9.20.29-s1, 9.21.26
bind9 (Ubuntu package) - addressed in versions 1:9.9.5.dfsg-3ubuntu0.19+esm15, 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11, 1:9.11.3+dfsg-1ubuntu1.19+esm6, 1:9.18.30-0ubuntu0.20.04.2+esm3, 1:9.18.39-0ubuntu0.22.04.7, 1:9.18.39-0ubuntu0.24.04.8, 1:9.20.24-1ubuntu0.4
bind-utils-debuginfo - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
bind-utils - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
bind - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
bind-debuginfo - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
bind-debugsource - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
bind-doc - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
python3-bind - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1
bind - addressed in versions 9.18.51^git20261003.d0a87358-2.fc43, 9.18.51^git20261003.d0a87358-2.fc44, 9.18.51^git20261003.d0a87358-11.fc46
bind-dnssec-doc - update to 9.20.21-7
bind-license - update to 9.20.21-7
bind-utils - update to 9.20.21-7
bind-libs - update to 9.20.21-7
bind-dnssec-utils - update to 9.20.21-7
bind-devel - update to 9.20.21-7
bind-debugsource - update to 9.20.21-7
bind-debuginfo - update to 9.20.21-7
bind-chroot - update to 9.20.21-7
bind - update to 9.20.21-7
bind9-next - addressed in versions 9.21.26-1.fc43, 9.21.26-1.fc44, 9.21.26-1.fc45
bind-dyndb-ldap - addressed in versions 11.11-15.fc43, 11.11-17.fc44, 11.11-18.fc46
bind9 (Debian package) - update to 1:9.20.29-1~deb13u1

External References

Related Security Bulletins