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: 2026-04-24
Score: 7 High
EPSS: < 1% Very Low
KEV: No
Impact: Bypassing the TUF signature threshold allows an authenticated user to forge delegated role metadata, potentially compromising the trust chain.
Action: Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-8m7c-8m39-rv4x awslabs/tough Delegated Roles have a Signature Threshold Bypass
History

Wed, 06 May 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Amazon
Amazon tough
Amazon tuftool
CPEs cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:*
cpe:2.3:a:amazon:tuftool:*:*:*:*:*:rust:*:*
Vendors & Products Amazon
Amazon tough
Amazon tuftool

Tue, 28 Apr 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Aws
Aws tough
Aws tuftool
Vendors & Products Aws
Aws tough
Aws tuftool

Fri, 24 Apr 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 24 Apr 2026 20:30:00 +0000


Fri, 24 Apr 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title Signature Threshold Bypass in awslabs/tough Delegated Roles
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 7, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-04-24T20:15:28.842Z

Reserved: 2026-04-24T16:15:44.932Z

Link: CVE-2026-6966

cve-icon Vulnrichment

Updated: 2026-04-24T20:15:15.302Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-24T20:16:28.883

Modified: 2026-05-06T15:24:56.720

Link: CVE-2026-6966

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-28T09:17:50Z

Weaknesses