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Fencer Vulns
high 7.5

CVE-2026-19666 json

Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path

published 2026-09-16 54 d ago modified 2026-10-26 13 d ago also EUVD-2026-80774

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Patch / fix

  • isc bind 9.20.29, 9.20.29-s1, 9.21.26
  • bind9 Debian 12 1:9.18.49-1~deb12u3
  • bind9 Debian 13 1:9.20.29-1~deb13u1
  • bind9 Debian 14 1:9.20.29-1

debian advisories DEBIAN-CVE-2026-19666

  • bind9 Ubuntu 22.04 LTS 1:9.18.39-0ubuntu0.22.04.7
  • bind9 Ubuntu 24.04 LTS 1:9.18.39-0ubuntu0.24.04.8
  • bind9 Ubuntu 26.10 1:9.20.24-1ubuntu3.1
  • bind9 Ubuntu 26.04 LTS 1:9.20.24-1ubuntu0.4
  • bind9 Ubuntu Pro 14.04 LTS 1:9.9.5.dfsg-3ubuntu0.19+esm15
  • bind9 Ubuntu Pro 16.04 LTS 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11
  • bind9 Ubuntu Pro 18.04 LTS 1:9.11.3+dfsg-1ubuntu1.19+esm6
  • bind9 Ubuntu Pro 20.04 LTS 1:9.18.30-0ubuntu0.20.04.2+esm3

ubuntu advisories UBUNTU-CVE-2026-19666

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

  • bind RHEL 8 32:9.11.36-16.el8_10.16
  • bind-sdb RHEL 8 32:9.11.36-16.el8_10.16
  • bind-libs RHEL 8 32:9.11.36-16.el8_10.16
  • bind-utils RHEL 8 32:9.11.36-16.el8_10.16
  • bind-chroot RHEL 8 32:9.11.36-16.el8_10.16
  • bind-pkcs11 RHEL 8 32:9.11.36-16.el8_10.16
  • bind-license RHEL 8 32:9.11.36-16.el8_10.16
  • python3-bind RHEL 8 32:9.11.36-16.el8_10.16

red hat advisories RHSA-2026:79162RHSA-2026:79113RHSA-2026:75767RHSA-2026:75578RHSA-2026:75577RHSA-2026:68279

  • bind SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 9.16.50-150500.8.46.1
  • bind SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 9.16.50-150400.5.70.1
  • bind SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 9.16.6-150300.22.65.1
  • bind Multi Linux Manager Tools SLE-Micro-5 9.16.6-150000.12.94.1
  • bind SLES for SAP applications 16.0, SLES 16.0 9.20.29-160000.1.1
  • bind SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 9.20.29-150700.3.32.2
  • bind SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.11.22-3.77.1
  • bind SLES for SAP 15 SP6, SLES 15 SP6-LTSS 9.18.50-150600.3.35.1

suse advisories SUSE-SU-2026:4772-1SUSE-SU-2026:4664-1SUSE-SU-2026:4657-1SUSE-SU-2026:4635-1SUSE-SU-2026:4608-1SUSE-SU-2026:4597-1

  • bind openSUSE Leap 16.0 9.20.29-160000.1.1
  • bind openSUSE Tumbleweed 9.20.29-1.1

opensuse advisories openSUSE-SU-2026:22049-1openSUSE-SU-2026:11916-1

  • bind9.16 AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • bind9.16-libs AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • bind9.16-utils AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • bind9.16-chroot AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • bind9.16-license AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • python3-bind9.16 AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • bind9.16-dnssec-utils AlmaLinux 8 32:9.16.23-0.22.el8_10.16
  • bind AlmaLinux 8 32:9.11.36-16.el8_10.16

almalinux advisories ALSA-2026:79113ALSA-2026:79162ALSA-2026:75577ALSA-2026:75578ALSA-2026:75767

  • bind9.16 Rocky Linux 8 2:9.16.23-0.22.el8_10.16
  • bind Rocky Linux 8 2:9.11.36-16.el8_10.16
  • bind Rocky Linux 10 2:9.18.33-15.el10_2.12
  • bind9.18 Rocky Linux 9 2:9.18.29-14.el9_8.10
  • bind Rocky Linux 9 2:9.16.23-40.el9_8.10

rocky linux advisories RLSA-2026:79113RLSA-2026:79162RLSA-2026:75577RLSA-2026:75578RLSA-2026:75767

  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 9.20.29-r0

alpine advisories ALPINE-CVE-2026-19666

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 9.20.30-1

azure linux advisories AZL-103365

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-2026-19666 updated cvss 7.5

bind: BIND: Denial of Service via malformed DNS64 responses

  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8 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_6.5, bind9.18-libs 9.18.29-4.el9_6.5
    fixed: vendor fix RHSA-2026:95048
  • Red Hat Enterprise Linux AppStream (v. 8) bind 9.11.36-16.el8_10.16, bind-sdb 9.11.36-16.el8_10.16, bind-libs 9.11.36-16.el8_10.16, bind-utils 9.11.36-16.el8_10.16, bind9.16 9.16.23-0.22.el8_10.16, bind-chroot 9.11.36-16.el8_10.16, +13 more
    fixed: vendor fix RHSA-2026:79162
  • Red Hat Enterprise Linux AppStream (v. 9) bind 9.16.23-40.el9_8.10, bind9.18 9.18.29-14.el9_8.10, bind-libs 9.16.23-40.el9_8.10, bind-utils 9.16.23-40.el9_8.10, bind-chroot 9.16.23-40.el9_8.10, bind-license 9.16.23-40.el9_8.10, +6 more
    fixed: vendor fix RHSA-2026:75767
  • Red Hat Enterprise Linux AppStream (v. 10) bind 9.18.33-15.el10_2.12, bind-libs 9.18.33-15.el10_2.12, bind-utils 9.18.33-15.el10_2.12, bind-chroot 9.18.33-15.el10_2.12, bind-license 9.18.33-15.el10_2.12, bind-dnssec-utils 9.18.33-15.el10_2.12
    fixed: vendor fix RHSA-2026:75577
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) bind 9.11.26-4.el8_4.10, bind-sdb 9.11.26-4.el8_4.10, bind-libs 9.11.26-4.el8_4.10, bind-utils 9.11.26-4.el8_4.10, bind-pkcs11 9.11.26-4.el8_4.10, bind-libs-lite 9.11.26-4.el8_4.10, +2 more
    fixed: vendor fix RHSA-2026:95477
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) bind 9.11.36-3.el8_6.13, bind-sdb 9.11.36-3.el8_6.13, bind-libs 9.11.36-3.el8_6.13, bind-utils 9.11.36-3.el8_6.13, bind9.16 9.16.23-0.7.el8_6.12, bind-chroot 9.11.36-3.el8_6.13, +8 more
    fixed: vendor fix RHSA-2026:95435
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) bind 9.11.36-8.el8_8.11, bind-sdb 9.11.36-8.el8_8.11, bind-utils 9.11.36-8.el8_8.11, bind-pkcs11 9.11.36-8.el8_8.11, bind9.16 9.16.23-0.14.el8_8.10, bind-libs-lite 9.11.36-8.el8_8.11, +3 more
    fixed: vendor fix RHSA-2026:95478
show 21 more
  • 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
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) bind 9.16.23-18.el9_4.13, bind-libs 9.16.23-18.el9_4.13
    fixed: vendor fix RHSA-2026:95241
  • 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_6.5, bind9.18 9.18.29-4.el9_6.5, bind-libs 9.16.23-31.el9_6.5, bind-utils 9.16.23-31.el9_6.5, bind9.18-libs 9.18.29-4.el9_6.5, bind-dnssec-utils 9.16.23-31.el9_6.5
    fixed: vendor fix RHSA-2026:95048
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) bind 9.11.26-4.el8_4.10, bind-sdb 9.11.26-4.el8_4.10, bind-libs 9.11.26-4.el8_4.10, bind-utils 9.11.26-4.el8_4.10, bind-pkcs11 9.11.26-4.el8_4.10, bind-libs-lite 9.11.26-4.el8_4.10, +2 more
    fixed: vendor fix RHSA-2026:95477
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) bind 9.11.36-3.el8_6.13, bind-sdb 9.11.36-3.el8_6.13, bind-libs 9.11.36-3.el8_6.13, bind-utils 9.11.36-3.el8_6.13, bind9.16 9.16.23-0.7.el8_6.12, bind-chroot 9.11.36-3.el8_6.13, +8 more
    fixed: vendor fix RHSA-2026:95435
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) bind 9.11.36-8.el8_8.11, bind-sdb 9.11.36-8.el8_8.11, bind-utils 9.11.36-8.el8_8.11, bind-pkcs11 9.11.36-8.el8_8.11, bind9.16 9.16.23-0.14.el8_8.10, bind-libs-lite 9.11.36-8.el8_8.11, +3 more
    fixed: vendor fix RHSA-2026:95478
  • Red Hat Enterprise Linux BaseOS (v. 8) bind 9.11.36-16.el8_10.16, bind-export-libs 9.11.36-16.el8_10.16
    fixed: vendor fix RHSA-2026:79162
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bind 9.11.26-4.el8_4.10, bind-export-libs 9.11.26-4.el8_4.10
    fixed: vendor fix RHSA-2026:95477
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bind 9.11.36-3.el8_6.13, bind-export-libs 9.11.36-3.el8_6.13
    fixed: vendor fix RHSA-2026:95435
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bind 9.11.36-8.el8_8.11, bind-export-libs 9.11.36-8.el8_8.11
    fixed: vendor fix RHSA-2026:95478
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bind 9.11.26-4.el8_4.10, bind-export-libs 9.11.26-4.el8_4.10
    fixed: vendor fix RHSA-2026:95477
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bind 9.11.36-3.el8_6.13, bind-export-libs 9.11.36-3.el8_6.13
    fixed: vendor fix RHSA-2026:95435
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bind 9.11.36-8.el8_8.11, bind-export-libs 9.11.36-8.el8_8.11
    fixed: vendor fix RHSA-2026:95478
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) bind-libs 9.16.23-40.el9_8.10, bind9.18-libs 9.18.29-14.el9_8.10
    fixed: vendor fix RHSA-2026:75767
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) bind-doc 9.18.33-15.el10_2.12, bind-devel 9.18.33-15.el10_2.12, bind-debuginfo 9.18.33-15.el10_2.12, bind-debugsource 9.18.33-15.el10_2.12, bind-libs-debuginfo 9.18.33-15.el10_2.12, bind-utils-debuginfo 9.18.33-15.el10_2.12, +1 more
    fixed: vendor fix RHSA-2026:75577
  • Red Hat Enterprise Linux CRB (v. 8) bind9.16-libs 9.16.23-0.22.el8_10.16
    fixed: vendor fix RHSA-2026:79113
  • Red Hat Enterprise Linux Server (v. 7 ELS) bind 9.11.4-26.P2.el7_9.22, bind-pkcs11 9.11.4-26.P2.el7_9.22 Red Hat Enterprise Linux Server Optional (v. 7 ELS) bind-sdb 9.11.4-26.P2.el7_9.22
    fixed: vendor fix RHSA-2026:95726
  • Red Hat Hardened Images bind 9.20.29-0.1.hum1, bind-libs 9.20.29-0.1.hum1, bind-utils 9.20.29-0.1.hum1, bind-chroot 9.20.29-0.1.hum1, bind-dnssec-utils 9.20.29-0.1.hum1
    fixed: vendor fix RHSA-2026:68279
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202610241758
    fixed: vendor fix RHSA-2026:89197
  • Red Hat CodeReady Linux Builder EUS (v.9.6) bind-doc 9.16.23-31.el9_6.5, bind-devel 9.16.23-31.el9_6.5, 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_6.5, bind-debugsource 9.16.23-31.el9_6.5, +7 more Red Hat Enterprise Linux 6 bind, bind-sdb, bind-libs, bind-utils, bind-chroot Red Hat Enterprise Linux 9 dhcp, dhcp-relay, dhcp-client, dhcp-common, dhcp-server Red Hat Enterprise Linux AppStream AUS (v.8.4) bind-chroot 9.11.26-4.el8_4.10, bind-license 9.11.26-4.el8_4.10, python3-bind 9.11.26-4.el8_4.10, bind-sdb-chroot 9.11.26-4.el8_4.10 Red Hat Enterprise Linux AppStream AUS (v.8.6) bind9.16-utils 9.16.23-0.7.el8_6.12, bind9.16-chroot 9.16.23-0.7.el8_6.12, bind9.16-license 9.16.23-0.7.el8_6.12 Red Hat Enterprise Linux AppStream E4S (v.8.8) bind-libs 9.11.36-8.el8_8.11, bind-chroot 9.11.36-8.el8_8.11, bind-license 9.11.36-8.el8_8.11, python3-bind 9.11.36-8.el8_8.11, bind-sdb-chroot 9.11.36-8.el8_8.11, bind9.16-utils 9.16.23-0.14.el8_8.10, +4 more
    +4 more products
    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 E4S (v.9.4) bind-utils 9.16.23-18.el9_4.13, bind-chroot 9.16.23-18.el9_4.13, bind-license 9.16.23-18.el9_4.13, python3-bind 9.16.23-18.el9_4.13, bind-dnssec-utils 9.16.23-18.el9_4.13 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-chroot 9.16.23-31.el9_6.5, bind-license 9.16.23-31.el9_6.5, python3-bind 9.16.23-31.el9_6.5, bind9.18-utils 9.18.29-4.el9_6.5, bind9.18-chroot 9.18.29-4.el9_6.5, bind9.18-dnssec-utils 9.18.29-4.el9_6.5
    not affected: vulnerable code not present

10 more not affected in the full advisory

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
52 d ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% 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:N/I:N/A:H

Affected products

  • ISC BIND 9

Classification

Weakness

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.