Vulnerability in Amazon Tough
CVE-2026-6967
Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users with delegated signing authority to bypass TUF specification integrity checks for delegated targets metadata and poison the local metadata cache, because load_delegations does not apply the same validation checks as the top-level targets metadata path. We recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.
EPSS: 0.002 (15.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L.
Affected products
- Amazon Tough
- Amazon Tuftool
- Aws Tough — versions 0.22.0
- Aws Tuftool — versions 0.15.0
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Release Notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Release Notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Product, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Product, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Vendor Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-6967?
- CVE-2026-6967 is a medium-severity vulnerability in Amazon Tough, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.9/10. Published 2026-04-24.
- How severe is CVE-2026-6967?
- Medium severity. CVSS v3 base score is 5.9 out of 10.