HarborGuard / CVE
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HIGHCVE-2026-6966Published Modified CNA AMZN

CVE-2026-6966: Signature Threshold Bypass in awslabs/tough Delegated Roles

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.

Metrics

CVSS v4.0
7.0
Severity
HIGH
Fixed in
0.15.0
Affected Products
2

Fix available

0.15.00.22.0
Patch commits
Affected packages
  • AWS / tough
    Fixed in 0.22.0
  • AWS / tuftool
    Fixed in 0.15.0
CVSS 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
References