CVE-2026-6966

Signature Threshold Bypass in awslabs/tough Delegated Roles

Published: Apr 24, 2026Updated: May 6, 2026 Sources: CVE List NVDCWE-347

5.3MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-347

Affected Products

AWS

commercial·US

toughOn-premNetwork Device

Cloud & SaaS

tuftoolSaaS

Cloud & SaaS / cloud-platform

amazon

commercial·US

toughSaaS

Cloud & SaaS / saas-application

tuftoolOn-premDev Tool

DevTools & CI / build-test-tools

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://aws.amazon.com/security/security-bulletins/2026-019-aws/

aws.amazon.com

https://github.com/awslabs/tough/releases/tag/tough-v0.22.0

github.com

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

github.com

and 3 more references View all →

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