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CVE

CWE

Training

CVE-2026-6966

Published: Apr 24, 2026

Modified: Apr 24, 2026

PUBLISHED

CVSS v3.1

5.3

MEDIUM

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.

Vendor	Product	Versions
AWS	tough	unaffected `0.22.0`
AWS	tuftool	unaffected `0.15.0`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

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

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