CVE-2026-6966
MEDIUMSignature Threshold Bypass in awslabs/tough Delegated Roles
Title source: cnaDescription
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.
References (6)
Core 6
Core References
Vendor Advisory vendor-advisory
https://aws.amazon.com/security/security-bulletins/2026-019-aws/
Patch patch
https://crates.io/crates/tough/0.22.0
Patch patch
https://crates.io/crates/tuftool/0.15.0
Third Party Advisory third-party-advisory
https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x
Scores
CVSS v3
5.3
EPSS
0.0022
EPSS Percentile
12.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-347
Status
published
Products (6)
amazon/tough
< 0.22.0
amazon/tuftool
< 0.15.0
AWS/tough
0.22.0
AWS/tuftool
0.15.0
crates.io/tough
0 - 0.22.0crates.io
crates.io/tuftool
0 - 0.15.0crates.io
Published
Apr 24, 2026
Tracked Since
Apr 24, 2026