Insufficient verification of data authenticity in ISC BIND - CVE-2026-19941

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU150223

Insufficient verification of data authenticity in ISC BIND - CVE-2026-19941

Published: September 16, 2026


Vulnerability identifier: #VU150223
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-19941
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to poison the DNS cache.

The vulnerability exists due to insufficient verification of data authenticity in the checkwildcard() function of the named resolver when validating wildcard-nonexistence proofs. A remote attacker can provide an out-of-zone NSEC record as proof that a wildcard does not exist to poison the DNS cache.

Exploitation requires control at the same or an upstream level of the zone name.


Affected software

ISC BIND
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 15
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 High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
Ubuntu
Server Applications Module
Basesystem Module
openSUSE Leap
openEuler
Anolis OS
Fedora
bind9 (Ubuntu package)
bind-utils-debuginfo
libisccc161
libirs161
libisc1107-debuginfo
liblwres161
bind-chrootenv
libirs161-debuginfo
bind-debuginfo
bind
libisccfg163-debuginfo
libdns1110-debuginfo
libisccc161-debuginfo
bind-utils
libdns1110
libbind9-161-debuginfo
libbind9-161
libisccfg163
bind-devel
libisc1107-debuginfo-32bit
libisc1107-32bit
python-bind
bind-doc
libisc1107
liblwres161-debuginfo
bind-debugsource
python3-bind
bind-license
bind-dnssec-doc
bind-pkcs11-utils
bind-pkcs11-libs
bind-pkcs11-devel
bind-pkcs11
bind-libs
bind-dnssec-utils
bind-chroot
bind9-next
bind-dyndb-ldap

How to mitigate CVE-2026-19941

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 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libisccc161 - update to 9.11.22-3.77.1
libirs161 - update to 9.11.22-3.77.1
libisc1107-debuginfo - update to 9.11.22-3.77.1
liblwres161 - update to 9.11.22-3.77.1
bind-chrootenv - update to 9.11.22-3.77.1
libirs161-debuginfo - update to 9.11.22-3.77.1
bind-debuginfo - addressed in versions 9.11.22-3.77.1, 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 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libisccfg163-debuginfo - update to 9.11.22-3.77.1
libdns1110-debuginfo - update to 9.11.22-3.77.1
libisccc161-debuginfo - update to 9.11.22-3.77.1
bind-utils - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libdns1110 - update to 9.11.22-3.77.1
libbind9-161-debuginfo - update to 9.11.22-3.77.1
libbind9-161 - update to 9.11.22-3.77.1
libisccfg163 - update to 9.11.22-3.77.1
bind-devel - update to 9.11.22-3.77.1
libisc1107-debuginfo-32bit - update to 9.11.22-3.77.1
libisc1107-32bit - update to 9.11.22-3.77.1
python-bind - update to 9.11.22-3.77.1
bind-doc - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libisc1107 - update to 9.11.22-3.77.1
liblwres161-debuginfo - update to 9.11.22-3.77.1
bind-debugsource - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
python3-bind - update to 9.16.23-33
bind-license - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-dnssec-doc - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-utils - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-pkcs11-utils - update to 9.16.23-33
bind-pkcs11-libs - update to 9.16.23-33
bind-pkcs11-devel - update to 9.16.23-33
bind-devel - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-pkcs11 - update to 9.16.23-33
bind-libs - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-dnssec-utils - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-debugsource - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-debuginfo - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-chroot - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
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-utils - update to 9.20.29-1
bind-dnssec-doc - update to 9.20.29-1
bind-doc - update to 9.20.29-1
bind-license - update to 9.20.29-1
bind-chroot - update to 9.20.29-1
bind - update to 9.20.29-1
bind-utils - update to 9.20.29-1
bind-libs - update to 9.20.29-1
bind-devel - update to 9.20.29-1
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

External References

Related Security Bulletins