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Fencer Vulns
high 7.5

CVE-2026-12617 json

Record ordering based unexpected exit with CNAME or DNAME

published 2026-07-22 3 mo ago modified 2026-11-02 7 d ago also EUVD-2026-47711

cvss
7.5
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 44%
public exploits
0
none known

Summary

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Patch / fix

  • isc bind 9.20.26
  • 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-2026-12617

  • 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

ubuntu advisories UBUNTU-CVE-2026-12617

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 9.20.26-0.1.hum1
  • bind-libs hummingbird 1 9.20.26-0.1.hum1
  • bind-utils hummingbird 1 9.20.26-0.1.hum1
  • bind-chroot hummingbird 1 9.20.26-0.1.hum1
  • bind-dnssec-utils hummingbird 1 9.20.26-0.1.hum1

red hat advisories RHSA-2026:54071

  • 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-2026:3452-1SUSE-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 Alpine 3.24, Alpine 3.23, Alpine 3.22 9.20.26-r0

alpine advisories ALPINE-CVE-2026-12617

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-93138

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-2026-12617 updated cvss 7.5

bind: bind9: Record ordering based unexpected exit with CNAME or DNAME

  • 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 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
    not affected: vulnerable code cannot be controlled by adversary
  • Red Hat Enterprise Linux 8 bind, bind-sdb, bind9.16, bind-libs, bind-utils, bind-chroot, +14 more Red Hat Enterprise Linux 9 bind, dhcp, bind9.18, bind-libs, bind-utils, dhcp-relay, +11 more
    not affected: component not present
  • Red Hat Enterprise Linux 10 bind
    not affected: vulnerable code cannot be controlled by adversary
  • 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
    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

0.52% chance of exploitation in the next 30 days, higher than 44% 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.