RewindexCVEsAmazon Web Services
CVE-2026-6966: Signature Threshold Bypass in awslabs/tough Delegated Roles
Medium · CVSS 5.3 (CVSS 3.1)EPSS 0.28%, 21th percentilePublished Updated Assigner: AMZN
Description
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.
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N · CWE-347
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
AWS: toughAWS: tuftool
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- aws.amazon.com/security/security-bulletins/2026-019-aws/ (opens in new tab)
- crates.io/crates/tough/0.22.0 (opens in new tab)
- crates.io/crates/tuftool/0.15.0 (opens in new tab)
- github.com/awslabs/tough/releases/tag/tough-v0.22.0 (opens in new tab)
- github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 (opens in new tab)
- github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)