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Fencer Vulns
high 8.1

CVE-2026-94300 json

Concurrent GSS-TSIG messages corrupt memory

published 2026-10-21 19 d ago modified 2026-10-26 13 d ago also EUVD-2026-107254

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

Patch / fix

  • isc bind 9.20.30, 9.20.30-s1, 9.21.27
  • bind9 Debian 13 1:9.20.30-1~deb13u1
  • bind9 Debian 14 1:9.20.30-1

debian advisories DEBIAN-CVE-2026-94300

  • bind9 Ubuntu 22.04 LTS 1:9.18.39-0ubuntu0.22.04.8
  • bind9 Ubuntu 24.04 LTS 1:9.18.39-0ubuntu0.24.04.9
  • bind9 Ubuntu 26.10 1:9.20.24-1ubuntu3.1
  • bind9 Ubuntu 26.04 LTS 1:9.20.24-1ubuntu0.5

ubuntu advisories UBUNTU-CVE-2026-94300

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 openSUSE Tumbleweed 9.20.30-1.1

opensuse advisories openSUSE-SU-2026:12231-1

  • bind AlmaLinux 9 32:9.16.23-40.el9_8.13
  • bind-libs AlmaLinux 9 32:9.16.23-40.el9_8.13
  • bind-utils AlmaLinux 9 32:9.16.23-40.el9_8.13
  • bind-chroot AlmaLinux 9 32:9.16.23-40.el9_8.13
  • bind-license AlmaLinux 9 32:9.16.23-40.el9_8.13
  • python3-bind AlmaLinux 9 32:9.16.23-40.el9_8.13
  • bind-dnssec-utils AlmaLinux 9 32:9.16.23-40.el9_8.13
  • bind AlmaLinux 8 32:9.11.36-18.el8_10

almalinux advisories ALSA-2026:93610ALSA-2026:93925ALSA-2026:94011ALSA-2026:93072ALSA-2026:92419

  • bind Rocky Linux 9 2:9.16.23-40.el9_8.13
  • 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
  • bind9.18 Rocky Linux 9 2:9.18.29-14.el9_8.12
  • bind Rocky Linux 10 2:9.18.33-15.el10_2.14

rocky linux advisories RLSA-2026:93610RLSA-2026:94011RLSA-2026:93925RLSA-2026:93072RLSA-2026:92419

  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 9.20.30-r0

alpine advisories ALPINE-CVE-2026-94300

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

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-2026-94300 updated cvss 8.1

bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay

  • Red Hat Enterprise Linux 9 dhcp, dhcp-relay, dhcp-client, dhcp-common, dhcp-server 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 9.11.36-18.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_8.13, bind9.18 9.18.29-14.el9_8.12, bind-libs 9.16.23-40.el9_8.13, bind-utils 9.16.23-40.el9_8.13, bind-chroot 9.16.23-40.el9_8.13, bind-license 9.16.23-40.el9_8.13, +6 more
    fixed: vendor fix RHSA-2026:93610
  • Red Hat Enterprise Linux AppStream (v. 10) bind 9.18.33-15.el10_2.14, bind-libs 9.18.33-15.el10_2.14, bind-utils 9.18.33-15.el10_2.14, bind-chroot 9.18.33-15.el10_2.14, bind-license 9.18.33-15.el10_2.14, bind-dnssec-utils 9.18.33-15.el10_2.14
    fixed: vendor fix RHSA-2026:92419
  • 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, +5 more
    fixed: vendor fix RHSA-2026:95478
show 24 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, +5 more
    fixed: vendor fix RHSA-2026:95478
  • 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 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_8.13, bind9.18-libs 9.18.29-14.el9_8.12
    fixed: vendor fix RHSA-2026:93610
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) bind-doc 9.18.33-15.el10_2.14, bind-devel 9.18.33-15.el10_2.14, bind-debuginfo 9.18.33-15.el10_2.14, bind-debugsource 9.18.33-15.el10_2.14, bind-libs-debuginfo 9.18.33-15.el10_2.14, bind-utils-debuginfo 9.18.33-15.el10_2.14, +1 more
    fixed: vendor fix RHSA-2026:92419
  • Red Hat Enterprise Linux CRB (v. 8) bind9.16-libs 9.16.23-0.22.el8_10.21
    fixed: vendor fix RHSA-2026:94011
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) bind 9.8.2-0.68.rc1.el6_10.20, bind-libs 9.8.2-0.68.rc1.el6_10.20
    fixed: vendor fix RHSA-2026:95727
  • Red Hat Enterprise Linux Server (v. 7 ELS) bind 9.11.4-26.P2.el7_9.22, bind-libs 9.11.4-26.P2.el7_9.22, bind-pkcs11 9.11.4-26.P2.el7_9.22, bind-libs-lite 9.11.4-26.P2.el7_9.22, bind-export-libs 9.11.4-26.P2.el7_9.22, bind-pkcs11-libs 9.11.4-26.P2.el7_9.22
    fixed: vendor fix RHSA-2026:95726
  • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) bind-sdb 9.8.2-0.68.rc1.el6_10.20
    fixed: vendor fix RHSA-2026:95727
  • 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 9.20.30-0.1.hum1, bind-libs 9.20.30-0.1.hum1, bind-utils 9.20.30-0.1.hum1, bind-chroot 9.20.30-0.1.hum1, bind-dnssec-utils 9.20.30-0.1.hum1
    fixed: vendor fix RHSA-2026:87309
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202611032353
    fixed: vendor fix RHSA-2026:95346
  • 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 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-chroot 9.16.23-0.14.el8_8.10, +2 more 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
    +1 more products
    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
    not affected: vulnerable code not present

14 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
no
Technical impact
total
Assessed
19 d ago

Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • ISC BIND 9

Classification

Weakness
  • CWE-415 Double Free
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

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.