Input validation error in ISC BIND - CVE-2026-78301

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Main Vulnerability Database Vulnerabilities #VU150220

Input validation error in ISC BIND - CVE-2026-78301

Published: September 16, 2026


Vulnerability identifier: #VU150220
CSH Severity: Low
CVSS v4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-78301
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to cause BIND to return attacker-supplied DNS data.

The vulnerability exists due to improper input validation in the named zone database when loading a malformed zone containing an NS or DNAME node above its origin. A remote privileged user can insert a malformed zone to cause BIND to return attacker-supplied DNS data.

On servers that also provide recursion, BIND can follow the locally sourced zone cut and cache attacker-supplied records for names outside the configured zone. On purely authoritative servers, queries may return out-of-zone referrals without the AA flag.


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-2026-78301

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