CVE-2026-6966 MEDIUM

CVE-2026-6966: Signature Threshold Bypass in awslabs/tough Delegated Roles

Weakness CWE-347
Published April 24, 2026
Last update April 24, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

What the vulnerability does

01Description

Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature, causing the client to accept forged delegated role metadata. We recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.

Key dates

02Disclosure timeline

April 24, 2026 CVE published
April 24, 2026 Record updated