CVE-2026-6966
Signature Threshold Bypass in awslabs/tough Delegated Roles
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | aws |
| Product | tough |
| Published | Apr 24, 2026 |
| Last Updated | Apr 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
AWS / tough
All versions affected AWS / tuftool
All versions affected References
aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-019-aws/ github.com: https://github.com/awslabs/tough/releases/tag/tough-v0.22.0 github.com: https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 crates.io: https://crates.io/crates/tough/0.22.0 crates.io: https://crates.io/crates/tuftool/0.15.0 github.com: https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x