CVE-2026-77119CWE-346

CVE-2026-77119

Medium · published September 16, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
12.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00226 · 12.6th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-09-16T19:17Z
References (3)
https://downloads.isc.org/isc/bind9/9.20.29 · [email protected]https://downloads.isc.org/isc/bind9/9.21.26 · [email protected]https://kb.isc.org/docs/cve-2026-77119 · [email protected]
EPSS history
Timeline
  • 18 SEP 04:01Z
    EPSS moved — → 0%
    epss
  • 16 SEP 14:17Z
    NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets
    cvelistv5