PT-2026-35079 · Aws · Tough+1

Published 2026-04-24 · Updated 2026-04-24 · CVE-2026-6966

NVD

CVSS v3.1

5.3

Medium

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

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.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-6966

Affected Products

Tough

Tuftool

References · 8

• https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 · Patch
• https://github.com/awslabs/tough/releases/tag/tough-v0.22.0 · Patch
• https://crates.io/crates/tuftool/0.15.0 · Patch
• https://aws.amazon.com/security/security-bulletins/2026-019-aws · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6966 · Security Note
• https://crates.io/crates/tough/0.22.0 · Patch
• https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x · Note
• https://twitter.com/CVEnew/status/2047798562055209431 · Twitter Post