CVE-2026-6966

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductAmazon Tough

PublishedApr 24, 2026

First seenApr 24, 2026

Weakness typeCWE-347CWE-347

How to fix

Update

amazon tough0.22.0 or later
amazon tuftool0.15.0 or later

Patches

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
amazon tough	v < 0.22.0	0.22.0
amazon tuftool	v < 0.15.0	0.15.0

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