Insufficient verification of data authenticity in ISC BIND - CVE-2026-77119

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Main Vulnerability Database Vulnerabilities #VU150229

Insufficient verification of data authenticity in ISC BIND - CVE-2026-77119

Published: September 16, 2026


Vulnerability identifier: #VU150229
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77119
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause DNS cache poisoning.

The vulnerability exists due to insufficient verification of data authenticity in BIND 9 NSEC3 insecure-referral proof validation when processing insecure-referral proofs. A remote attacker can provide a validly signed NSEC3 record from an unrelated sibling zone to cause DNS cache poisoning.


Affected software

ISC BIND
Debian Linux
bind9 (Debian package)

How to mitigate CVE-2026-77119

Install security update from vendor's website.

ISC BIND - addressed in versions 9.20.29, 9.20.29-s1, 9.21.26
bind9 (Debian package) - update to 1:9.20.29-1~deb13u1

External References

Related Security Bulletins