VDB
CVE-2026-6966
CVE-2026-6966
PUBLISHED
CVSS 5.300000190734863 MEDIUM
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.
EPSS 0.02% · 5.9th percentile
Risk Scores
CVSS v3.1
5.300000190734863
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.02%
5.9th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| AWS | tough | 0.22.0 |
| AWS | tuftool | 0.15.0 |
Timeline
- Apr 24, 2026 CVE Published
- Apr 24, 2026 CVE Updated
- Apr 25, 2026 EPSS Score
- May 6, 2026 Security Advisory
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
References
- https://aws.amazon.com/security/security-bulletins/2026-019-aws/ vendor-advisory
- https://github.com/awslabs/tough/releases/tag/tough-v0.22.0 patch
- https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 patch
- https://crates.io/crates/tough/0.22.0 patch
- https://crates.io/crates/tuftool/0.15.0 patch
- https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x third-party-advisory