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Fencer Vulns
medium 5.9

CVE-2026-77119 json

NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets

published 2026-09-16 53 d ago modified 2026-10-26 13 d 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

suse advisories SUSE-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

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
52 d ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% 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:H/A:N

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.