CVE-2026-77119

Public on 2026-09-16

Modified on 2026-09-18

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.

Severity

Medium

See what this means

CVSS v3 Base Score

5.9

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Core	bind	Pending Fix
Amazon Linux 2023	bind	Pending Fix
Amazon Linux 2027 Preview	bind	Pending Fix
Amazon Linux 2 - Core	dhcp	Not Affected

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-77119 Mitre: CVE-2026-77119