Improper Check or Handling of Exceptional Conditions in ISC BIND - CVE-2026-11331

Vulnerability identifier: #VU139212

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-11331

CWE-ID: CWE-703

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass RPZ rules.

The vulnerability exists due to improper error handling in RPZ processing when processing sufficiently long query names that trigger a NAMETOOLONG condition with wildcard CNAME policies. A remote attacker can send a crafted query name to bypass RPZ rules.

The issue only affects resolvers that use RPZ with wildcard CNAME policies.

ISC BIND
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise High Performance Computing 15
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 Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro
SUSE Manager Client Tools for SLE Micro
SUSE Multi-Linux Manager Client Tools for SLE Micro
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Basesystem Module
Server Applications Module
openSUSE Leap
openEuler
Ubuntu
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
bind-export-libs
python3-bind
bind-license
bind-utils
bind-sdb-chroot
bind-sdb
bind-pkcs11-utils
bind-pkcs11-libs
bind-pkcs11-devel
bind-pkcs11
bind-lite-devel
bind-libs-lite
bind-libs
bind-export-devel
bind-devel
bind-chroot
bind
libirs1601
libdns1605-debuginfo
libns1604
libns1604-debuginfo
libbind9-1600
libisccfg1600-debuginfo
libdns1605
libdns1605-64bit
bind-utils-debuginfo
libirs1601-debuginfo
libisc1606
libisccfg1600-64bit
libirs1601-64bit
libisccc1600-64bit
libbind9-1600-64bit
libisccc1600
libisc1606-debuginfo
libbind9-1600-debuginfo
libisccc1600-debuginfo
bind-debuginfo
bind-debugsource
libisc1606-64bit
libisccfg1600
bind-chrootenv
bind-doc
libirs-devel
bind9.16 (Red Hat package)
bind9.16-dnssec-utils
python3-bind9.16
bind9.16-license
bind9.16-doc
bind9.16-utils
bind9.16-libs
bind9.16-devel
bind9.16-chroot
bind9.16
bind (Red Hat package) main
bind-dnssec-utils
bind-dnssec-doc
bind-dyndb-ldap
bind9 (Ubuntu package)
bind9 (Debian package)

Install security update from vendor's website.

ISC BIND - addressed in versions 9.20.26, 9.20.26-s1, 9.21.24
bind-export-libs - update to 9.11.36-16.0.1
python3-bind - update to 9.11.36-16.0.1
bind-license - addressed in versions 9.11.36-16.0.1, 9.20.26-1
bind-utils - addressed in versions 9.11.36-16.0.1, 9.20.26-1
bind-sdb-chroot - update to 9.11.36-16.0.1
bind-sdb - update to 9.11.36-16.0.1
bind-pkcs11-utils - update to 9.11.36-16.0.1
bind-pkcs11-libs - update to 9.11.36-16.0.1
bind-pkcs11-devel - update to 9.11.36-16.0.1
bind-pkcs11 - update to 9.11.36-16.0.1
bind-lite-devel - update to 9.11.36-16.0.1
bind-libs-lite - update to 9.11.36-16.0.1
bind-libs - addressed in versions 9.11.36-16.0.1, 9.20.26-1
bind-export-devel - update to 9.11.36-16.0.1
bind-devel - addressed in versions 9.11.36-16.0.1, 9.20.26-1
bind-chroot - addressed in versions 9.11.36-16.0.1, 9.20.26-1
bind - addressed in versions 9.11.36-16.0.1, 9.20.26-1
libirs1601 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libdns1605-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libns1604 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
bind-utils - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1, 9.18.50-150600.3.32.1, 9.20.26-150700.3.29.1
libns1604-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libbind9-1600 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libisccfg1600-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libdns1605 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libdns1605-64bit - update to 9.16.6-150000.12.91.1
bind-utils-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1, 9.18.50-150600.3.32.1, 9.20.26-150700.3.29.1
libirs1601-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libisc1606 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
python3-bind - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1
libisccfg1600-64bit - update to 9.16.6-150000.12.91.1
libirs1601-64bit - update to 9.16.6-150000.12.91.1
libisccc1600-64bit - update to 9.16.6-150000.12.91.1
libbind9-1600-64bit - update to 9.16.6-150000.12.91.1
libisccc1600 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libisc1606-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libbind9-1600-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
libisccc1600-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
bind-debuginfo - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1, 9.18.50-150600.3.32.1, 9.20.26-150700.3.29.1
bind-debugsource - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1, 9.18.50-150600.3.32.1, 9.20.26-150700.3.29.1
libisc1606-64bit - update to 9.16.6-150000.12.91.1
libisccfg1600 - addressed in versions 9.16.6-150000.12.91.1, 9.16.6-150300.22.62.1
bind-chrootenv - update to 9.16.6-150300.22.62.1
bind-devel - update to 9.16.6-150300.22.62.1
bind-doc - addressed in versions 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1, 9.18.50-150600.3.32.1, 9.20.26-150700.3.29.1
libirs-devel - update to 9.16.6-150300.22.62.1
bind - addressed in versions 9.16.6-150300.22.62.1, 9.16.50-150400.5.65.1, 9.16.50-150500.8.41.1, 9.18.50-150600.3.32.1, 9.20.26-150700.3.29.1
bind9.16 (Red Hat package) - addressed in versions 9.16.23-0.7.el8_6.11, 9.16.23-0.14.el8_8.9, 9.16.23-0.22.el8_10.12
bind9.16-dnssec-utils - update to 9.16.23-0.22
python3-bind9.16 - update to 9.16.23-0.22
bind9.16-license - update to 9.16.23-0.22
bind9.16-doc - update to 9.16.23-0.22
bind9.16-utils - update to 9.16.23-0.22
bind9.16-libs - update to 9.16.23-0.22
bind9.16-devel - update to 9.16.23-0.22
bind9.16-chroot - update to 9.16.23-0.22
bind9.16 - update to 9.16.23-0.22
bind (Red Hat package) main - addressed in versions 9.16.23-18.el9_4.12, 9.16.23-40.el9_8.8
bind-devel - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-dnssec-utils - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-chroot - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
python3-bind - update to 9.16.23-31
bind-license - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-dnssec-doc - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-utils - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-pkcs11-utils - update to 9.16.23-31
bind-pkcs11-libs - update to 9.16.23-31
bind-pkcs11-devel - update to 9.16.23-31
bind-pkcs11 - update to 9.16.23-31
bind-libs - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-debuginfo - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind-debugsource - addressed in versions 9.16.23-31, 9.18.21-11, 9.20.21-4
bind - addressed in versions 9.18.50-2.fc43, 9.18.50-2.fc44, 9.18.50-34.fc45, 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 9.20.26-1
bind-doc - update to 9.20.26-1
bind-dnssec-doc - update to 9.20.26-1
bind-dyndb-ldap - addressed in versions 11.11-15.fc43, 11.11-17.fc44, 11.11-18.fc46
bind9 (Ubuntu package) - addressed in versions 1:9.18.39-0ubuntu0.22.04.5, 1:9.18.39-0ubuntu0.24.04.6, 1:9.20.24-1ubuntu0.2
bind9 (Debian package) - update to 1:9.20.26-1~deb13u1

• https://kb.isc.org/docs/cve-2026-11331-potential-wildcard-cname-rpz-policy-bypass
• https://kb.isc.org/docs/cve-2026-11331

• Multiple vulnerabilities in ISC BIND
• Debian update for bind9
• SUSE update for bind
• SUSE update for bind
• SUSE update for bind
• SUSE update for bind
• SUSE update for bind
• openEuler 24.03 LTS SP1 update for bind
• openEuler 24.03 LTS SP4 update for bind
• openEuler 24.03 LTS SP3 update for bind
• SUSE update for bind
• Anolis OS update for bind
• Red Hat Enterprise Linux 8 update for bind9.16
• Red Hat Enterprise Linux 9 update for bind
• openEuler 22.03 LTS SP4 update for bind
• Anolis OS update for bind
• Anolis OS update for bind9.16
• Ubuntu update for bind9
• Red Hat Enterprise Linux 9 update for bind
• Fedora 45 update for bind
• Fedora 44 update for bind
• Fedora 43 update for bind
• Red Hat Enterprise Linux 8 update for bind9.16
• Red Hat Enterprise Linux 8 update for bind9.16
• Fedora 43 update for bind, bind-dyndb-ldap
• Fedora 44 update for bind, bind-dyndb-ldap
• Fedora 46 update for bind, bind-dyndb-ldap