MEDIUM

CVE-2026-77119

2026-09-16 CVSS v3.1

CVSS

5.9

Description

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.

Weakness (CWE)

CWE-346

EPSS Score

0.19%

Probability of exploitation in next 30 days

8.7th percentile

References

https://downloads.isc.org/isc/bind9/9.20.29 https://downloads.isc.org/isc/bind9/9.21.26 https://kb.isc.org/docs/cve-2026-77119

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Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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