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Fencer Vulns
high 7.5

CVE-2026-11331 json

Potential wildcard CNAME RPZ policy bypass

published 2026-07-22 3 mo ago modified 2026-11-02 6 d ago also EUVD-2026-47706

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Patch / fix

  • isc bind 9.20.26, 9.21.24
  • bind9 Debian 12 1:9.18.49-1~deb12u2
  • bind9 Debian 13 1:9.20.26-1~deb13u1
  • bind9 Debian 14 1:9.20.26-1

debian advisories DEBIAN-CVE-2026-11331

  • bind9 Ubuntu 22.04 LTS 1:9.18.39-0ubuntu0.22.04.5
  • bind9 Ubuntu 24.04 LTS 1:9.18.39-0ubuntu0.24.04.6
  • bind9 Ubuntu 26.04 LTS 1:9.20.24-1ubuntu0.2
  • bind9 Ubuntu Pro 20.04 LTS 1:9.18.30-0ubuntu0.20.04.2+esm3

ubuntu advisories UBUNTU-CVE-2026-11331

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind9.18 RHEL 9 32:9.18.29-14.el9_8.8
  • bind9.18-libs RHEL 9 32:9.18.29-14.el9_8.8
  • bind9.18-utils RHEL 9 32:9.18.29-14.el9_8.8
  • bind9.18-chroot RHEL 9 32:9.18.29-14.el9_8.8
  • bind9.18-dnssec-utils RHEL 9 32:9.18.29-14.el9_8.8
  • bind RHEL 10.2 32:9.18.33-15.el10_2.10
  • bind-libs RHEL 10.2 32:9.18.33-15.el10_2.10
  • bind-utils RHEL 10.2 32:9.18.33-15.el10_2.10

red hat advisories RHSA-2026:80501RHSA-2026:79160RHSA-2026:57189RHSA-2026:55441RHSA-2026:55442RHSA-2026:55437

  • bind SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 9.16.6-150300.22.62.1
  • bind Multi Linux Manager Tools SLE-Micro-5, Manager Client Tools for SLE Micro 5 9.16.6-150000.12.91.1
  • bind SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 9.16.50-150500.8.41.1
  • bind SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 9.16.50-150400.5.65.1
  • bind SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 9.20.26-150700.3.29.1
  • bind SLES for SAP 15 SP6, SLES 15 SP6-LTSS 9.18.50-150600.3.32.1

suse advisories SUSE-SU-2026:3554-1SUSE-SU-2026:3517-1SUSE-SU-2026:3477-1SUSE-SU-2026:3476-1SUSE-SU-2026:3452-1SUSE-SU-2026:3426-1

  • bind openSUSE Leap 16.0 9.20.26-160000.1.1
  • bind openSUSE Tumbleweed 9.20.26-1.1

opensuse advisories openSUSE-SU-2026:21489-1openSUSE-SU-2026:11375-1

  • bind AlmaLinux 10 32:9.18.33-15.el10_2.10
  • bind-libs AlmaLinux 10 32:9.18.33-15.el10_2.10
  • bind-utils AlmaLinux 10 32:9.18.33-15.el10_2.10
  • bind-chroot AlmaLinux 10 32:9.18.33-15.el10_2.10
  • bind-license AlmaLinux 10 32:9.18.33-15.el10_2.10
  • bind-dnssec-utils AlmaLinux 10 32:9.18.33-15.el10_2.10
  • bind9.18 AlmaLinux 9 32:9.18.29-14.el9_8.8
  • bind9.18-libs AlmaLinux 9 32:9.18.29-14.el9_8.8

almalinux advisories ALSA-2026:55437ALSA-2026:55442ALSA-2026:54509ALSA-2026:54510

  • bind Rocky Linux 10 2:9.18.33-15.el10_2.10
  • bind9.18 Rocky Linux 9 2:9.18.29-14.el9_8.8
  • bind Rocky Linux 9 2:9.16.23-40.el9_8.8
  • bind9.16 Rocky Linux 8 2:9.16.23-0.22.el8_10.12

rocky linux advisories RLSA-2026:55437RLSA-2026:55442RLSA-2026:54510RLSA-2026:54509

  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 9.20.26-r0

alpine advisories ALPINE-CVE-2026-11331

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind Azure Linux 3.0 9.20.26-1

azure linux advisories AZL-93129

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-11331 updated cvss 7.5

bind: bind: Denial of Service via long query names in RPZ processing

  • Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) bind-libs 9.16.23-31.el9_6.4, bind9.18-libs 9.18.29-4.el9_6.5
    fixed: vendor fix RHSA-2026:55441
  • Red Hat Enterprise Linux AppStream (v. 8) bind9.16 9.16.23-0.22.el8_10.12, bind9.16-libs 9.16.23-0.22.el8_10.12, bind9.16-utils 9.16.23-0.22.el8_10.12, bind9.16-chroot 9.16.23-0.22.el8_10.12, bind9.16-license 9.16.23-0.22.el8_10.12, python3-bind9.16 9.16.23-0.22.el8_10.12, +1 more
    fixed: vendor fix RHSA-2026:54509
  • Red Hat Enterprise Linux AppStream (v. 9) bind 9.16.23-40.el9_8.8, bind9.18 9.18.29-14.el9_8.8, bind-libs 9.16.23-40.el9_8.8, bind-utils 9.16.23-40.el9_8.8, bind-chroot 9.16.23-40.el9_8.8, bind-license 9.16.23-40.el9_8.8, +6 more
    fixed: vendor fix RHSA-2026:54510
  • Red Hat Enterprise Linux AppStream (v. 10) bind 9.18.33-15.el10_2.10, bind-libs 9.18.33-15.el10_2.10, bind-utils 9.18.33-15.el10_2.10, bind-chroot 9.18.33-15.el10_2.10, bind-license 9.18.33-15.el10_2.10, bind-dnssec-utils 9.18.33-15.el10_2.10
    fixed: vendor fix RHSA-2026:55437
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) bind9.16 9.16.23-0.7.el8_6.11, bind9.16-libs 9.16.23-0.7.el8_6.11
    fixed: vendor fix RHSA-2026:80501
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) bind9.16 9.16.23-0.14.el8_8.9, bind9.16-libs 9.16.23-0.14.el8_8.9
    fixed: vendor fix RHSA-2026:79160
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) bind 9.16.23-11.el9_2.12, bind-libs 9.16.23-11.el9_2.12
    fixed: vendor fix RHSA-2026:95242
show 17 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) bind 9.16.23-18.el9_4.12, bind-libs 9.16.23-18.el9_4.12, bind-utils 9.16.23-18.el9_4.12, bind-chroot 9.16.23-18.el9_4.12, bind-license 9.16.23-18.el9_4.12, python3-bind 9.16.23-18.el9_4.12, +1 more
    fixed: vendor fix RHSA-2026:57189
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) bind 9.18.33-4.el10_0.6, bind-libs 9.18.33-4.el10_0.6
    fixed: vendor fix RHSA-2026:94115
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) bind 9.16.23-31.el9_6.4, bind9.18 9.18.29-4.el9_6.5, bind-libs 9.16.23-31.el9_6.4, bind9.18-libs 9.18.29-4.el9_6.5
    fixed: vendor fix RHSA-2026:55441
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) bind9.16 9.16.23-0.7.el8_6.11, bind9.16-libs 9.16.23-0.7.el8_6.11
    fixed: vendor fix RHSA-2026:80501
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) bind9.16 9.16.23-0.14.el8_8.9, bind9.16-libs 9.16.23-0.14.el8_8.9
    fixed: vendor fix RHSA-2026:79160
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) bind-libs 9.16.23-40.el9_8.8, bind9.18-libs 9.18.29-14.el9_8.8
    fixed: vendor fix RHSA-2026:54510
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) bind-doc 9.18.33-15.el10_2.10, bind-devel 9.18.33-15.el10_2.10, bind-debuginfo 9.18.33-15.el10_2.10, bind-debugsource 9.18.33-15.el10_2.10, bind-libs-debuginfo 9.18.33-15.el10_2.10, bind-utils-debuginfo 9.18.33-15.el10_2.10, +1 more
    fixed: vendor fix RHSA-2026:55437
  • Red Hat Enterprise Linux CRB (v. 8) bind9.16-libs 9.16.23-0.22.el8_10.12
    fixed: vendor fix RHSA-2026:54509
  • Red Hat Hardened Images bind 9.20.26-0.1.hum1, bind-libs 9.20.26-0.1.hum1, bind-utils 9.20.26-0.1.hum1, bind-chroot 9.20.26-0.1.hum1, bind-dnssec-utils 9.20.26-0.1.hum1
    fixed: vendor fix RHSA-2026:54071
  • Red Hat OpenShift Container Platform 4.16 rhcos 416.94.202609011112
    fixed: vendor fix RHSA-2026:62549
  • Red Hat OpenShift Container Platform 4.17 rhcos 417.94.202609191027
    fixed: vendor fix RHSA-2026:70586
  • Red Hat OpenShift Container Platform 4.18 rhcos 418.94.202609031320, rhcos 418.94.202609171815
    fixed: vendor fix RHSA-2026:65851
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202608251819
    fixed: vendor fix RHSA-2026:60440
  • Red Hat CodeReady Linux Builder EUS (v.9.6) bind-doc 9.16.23-31.el9_6.4, bind-devel 9.16.23-31.el9_6.4, bind9.18-doc 9.18.29-4.el9_6.5, bind9.18-devel 9.18.29-4.el9_6.5, bind-debuginfo 9.16.23-31.el9_6.4, bind-debugsource 9.16.23-31.el9_6.4, +8 more Red Hat Enterprise Linux 6 bind, bind-sdb, bind-libs, bind-utils, bind-chroot Red Hat Enterprise Linux 7 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +6 more Red Hat Enterprise Linux 8 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +7 more
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 9 dhcp, dhcp-relay, dhcp-client, dhcp-common, dhcp-server
    not affected: vulnerable code not in execute path
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) bind9.16-utils 9.16.23-0.7.el8_6.11, bind9.16-chroot 9.16.23-0.7.el8_6.11, bind9.16-license 9.16.23-0.7.el8_6.11 Red Hat Enterprise Linux AppStream E4S (v.8.8) bind9.16-utils 9.16.23-0.14.el8_8.9, bind9.16-chroot 9.16.23-0.14.el8_8.9, bind9.16-license 9.16.23-0.14.el8_8.9, python3-bind9.16 9.16.23-0.14.el8_8.9, bind9.16-dnssec-utils 9.16.23-0.14.el8_8.9 Red Hat Enterprise Linux AppStream E4S (v.9.2) bind-utils 9.16.23-11.el9_2.12, bind-chroot 9.16.23-11.el9_2.12, bind-license 9.16.23-11.el9_2.12, python3-bind 9.16.23-11.el9_2.12, bind-dnssec-utils 9.16.23-11.el9_2.12 Red Hat Enterprise Linux AppStream EUS (v. 10.0) bind-utils 9.18.33-4.el10_0.6, bind-chroot 9.18.33-4.el10_0.6, bind-license 9.18.33-4.el10_0.6, bind-dnssec-utils 9.18.33-4.el10_0.6 Red Hat Enterprise Linux AppStream EUS (v.9.6) bind-utils 9.16.23-31.el9_6.4, bind-chroot 9.16.23-31.el9_6.4, bind-license 9.16.23-31.el9_6.4, python3-bind 9.16.23-31.el9_6.4, bind9.18-utils 9.18.29-4.el9_6.5, bind9.18-chroot 9.18.29-4.el9_6.5, +2 more Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) bind9.16-utils 9.16.23-0.7.el8_6.11, bind9.16-chroot 9.16.23-0.7.el8_6.11, bind9.16-license 9.16.23-0.7.el8_6.11
    +2 more products
    Red Hat Enterprise Linux AppStream TUS (v.8.8) bind9.16-utils 9.16.23-0.14.el8_8.9, bind9.16-chroot 9.16.23-0.14.el8_8.9, bind9.16-license 9.16.23-0.14.el8_8.9, python3-bind9.16 9.16.23-0.14.el8_8.9, bind9.16-dnssec-utils 9.16.23-0.14.el8_8.9 Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) bind-doc 9.18.33-4.el10_0.6, bind-devel 9.18.33-4.el10_0.6, bind-debuginfo 9.18.33-4.el10_0.6, bind-debugsource 9.18.33-4.el10_0.6, bind-libs-debuginfo 9.18.33-4.el10_0.6, bind-utils-debuginfo 9.18.33-4.el10_0.6, +1 more
    not affected: vulnerable code not present
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • ISC BIND 9

Classification

Weakness
  • CWE-790 Improper Filtering of Special Elements

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.