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Fencer Intel
medium 5.9

CVE-2026-77119 json

NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets

published last mo. modified 16d ago also EUVD-2026-80787

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through. 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

  • bind9 Debian 13 1:9.20.29-1~deb13u1
  • bind9 Debian 14 1:9.20.29-1

debian advisories DEBIAN-CVE-2026-77119

  • 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-2026-77119

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 9.11.22-3.80.1

suse advisories SUSE-SU-2026:5161-1SUSE-SU-2026:5118-1SUSE-SU-2026:4772-1SUSE-SU-2026:4664-1SUSE-SU-2026:24157-1SUSE-SU-2026:4285-1

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

alpine advisories ALPINE-CVE-2026-77119

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 9.20.29-1

azure linux advisories AZL-103341

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

Is CVE-2026-77119 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2026-77119 updated cvss 5.9

bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof

  • 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, bind9.16, bind-libs, bind-utils, bind-chroot, +14 more Red Hat Enterprise Linux 9 bind, bind9.18, bind-libs, bind-utils, bind-chroot, bind-license, +6 more Red Hat Enterprise Linux 10 bind 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 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
    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
last mo.

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-11).

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:H/A:N

Affected products

  • ISC BIND 9

Classification

Weakness

References

Sources

Fencer Intel 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.