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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.

PUBLISHED Reserved 2026-04-24 | Published 2026-04-24 | Updated 2026-04-24 | Assigner AMZN




MEDIUM: 5.3CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

HIGH: 7.0CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

Problem types

CWE-347: Improper Verification of Cryptographic Signature

Product status

Default status
unaffected

0.22.0
unaffected

Default status
unaffected

0.15.0
unaffected

References

aws.amazon.com/security/security-bulletins/2026-019-aws/ vendor-advisory

github.com/awslabs/tough/releases/tag/tough-v0.22.0 patch

github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 patch

crates.io/crates/tough/0.22.0 patch

crates.io/crates/tuftool/0.15.0 patch

github.com/.../tough/security/advisories/GHSA-8m7c-8m39-rv4x third-party-advisory

cve.org (CVE-2026-6966)

nvd.nist.gov (CVE-2026-6966)

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