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Fencer Vulns
medium 5.9

CVE-2026-19662 json

qpcache NOQNAME proof use-after-free crashes recursive resolver

published 2026-09-16 54 d ago modified 2026-10-26 13 d ago also EUVD-2026-80743

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 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
  • 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-2026-19662

  • 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 20.04 LTS 1:9.18.30-0ubuntu0.20.04.2+esm3

ubuntu advisories UBUNTU-CVE-2026-19662

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 hummingbird 1 9.20.29-0.1.hum1
  • bind-libs hummingbird 1 9.20.29-0.1.hum1
  • bind-utils hummingbird 1 9.20.29-0.1.hum1
  • bind-chroot hummingbird 1 9.20.29-0.1.hum1
  • bind-dnssec-utils hummingbird 1 9.20.29-0.1.hum1

red hat advisories RHSA-2026:68279

  • bind Multi Linux Manager Tools SLE-Micro-5 9.16.6-150000.12.97.1
  • 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 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-2026:5118-1SUSE-SU-2026:4772-1SUSE-SU-2026:4664-1SUSE-SU-2026:4635-1SUSE-SU-2026:4608-1SUSE-SU-2026:24157-1

  • 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

  • bind AlmaLinux 8 32:9.11.36-18.el8_10
  • bind-sdb AlmaLinux 8 32:9.11.36-18.el8_10
  • bind-libs AlmaLinux 8 32:9.11.36-18.el8_10
  • bind-utils AlmaLinux 8 32:9.11.36-18.el8_10
  • bind-chroot AlmaLinux 8 32:9.11.36-18.el8_10
  • bind-pkcs11 AlmaLinux 8 32:9.11.36-18.el8_10
  • bind-license AlmaLinux 8 32:9.11.36-18.el8_10
  • python3-bind AlmaLinux 8 32:9.11.36-18.el8_10

almalinux advisories ALSA-2026:93925ALSA-2026:94011ALSA-2026:89745ALSA-2026:89746ALSA-2026:90328

  • bind9.16 Rocky Linux 8 2:9.16.23-0.22.el8_10.21
  • bind Rocky Linux 8 2:9.11.36-18.el8_10
  • bind Rocky Linux 10 2:9.18.33-15.el10_2.13
  • bind Rocky Linux 9 2:9.16.23-40.el9_8.12
  • bind9.18 Rocky Linux 9 2:9.18.29-14.el9_8.11

rocky linux advisories RLSA-2026:94011RLSA-2026:93925RLSA-2026:90328RLSA-2026:89745RLSA-2026:89746

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

alpine advisories ALPINE-CVE-2026-19662

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-103356

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-2026-19662 updated cvss 5.9

bind9: bind: BIND 9: Denial of Service via crafted DNSSEC responses

  • Red Hat Enterprise Linux 7 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +6 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) bind 9.11.36-18.el8_10, bind-sdb 9.11.36-18.el8_10, bind-libs 9.11.36-18.el8_10, bind-utils 9.11.36-18.el8_10, bind-chroot 9.11.36-18.el8_10, bind-pkcs11 9.11.36-18.el8_10, +13 more
    fixed: vendor fix RHSA-2026:93925
  • Red Hat Enterprise Linux AppStream (v. 9) bind 9.16.23-40.el9_8.12, bind9.18 9.18.29-14.el9_8.11, bind-libs 9.16.23-40.el9_8.12, bind-utils 9.16.23-40.el9_8.12, bind-chroot 9.16.23-40.el9_8.12, bind-license 9.16.23-40.el9_8.12, +6 more
    fixed: vendor fix RHSA-2026:89745
  • Red Hat Enterprise Linux AppStream (v. 10) bind 9.18.33-15.el10_2.13, bind-libs 9.18.33-15.el10_2.13, bind-utils 9.18.33-15.el10_2.13, bind-chroot 9.18.33-15.el10_2.13, bind-license 9.18.33-15.el10_2.13, bind-dnssec-utils 9.18.33-15.el10_2.13
    fixed: vendor fix RHSA-2026:90328
  • Red Hat Enterprise Linux BaseOS (v. 8) bind 9.11.36-18.el8_10, bind-export-libs 9.11.36-18.el8_10
    fixed: vendor fix RHSA-2026:93925
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) bind-libs 9.16.23-40.el9_8.12, bind9.18-libs 9.18.29-14.el9_8.11
    fixed: vendor fix RHSA-2026:89745
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) bind-doc 9.18.33-15.el10_2.13, bind-devel 9.18.33-15.el10_2.13, bind-debuginfo 9.18.33-15.el10_2.13, bind-debugsource 9.18.33-15.el10_2.13, bind-libs-debuginfo 9.18.33-15.el10_2.13, bind-utils-debuginfo 9.18.33-15.el10_2.13, +1 more
    fixed: vendor fix RHSA-2026:90328
  • Red Hat Enterprise Linux CRB (v. 8) bind9.16-libs 9.16.23-0.22.el8_10.21
    fixed: vendor fix RHSA-2026:94011
show 2 more
  • 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 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 OpenShift AI (RHOAI) rhoai/odh-training-operator-rhel9
    not affected: vulnerable code not present

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
no
Technical impact
partial
Assessed
52 d ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/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.