Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Amazon | Tough | >= 0.9.0, < 0.22.0 |
| Amazon | Tuftool | < 0.15.0 |
Related Weaknesses (CWE)
References
- https://aws.amazon.com/security/security-bulletins/2026-019-aws/Vendor Advisory
- https://crates.io/crates/tough/0.22.0Product
- https://crates.io/crates/tuftool/0.15.0Product
- https://github.com/awslabs/tough/releases/tag/tough-v0.22.0Release Notes
- https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0Release Notes
- https://github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3Vendor Advisory
FAQ
What is CVE-2026-6967?
CVE-2026-6967 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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...
How severe is CVE-2026-6967?
CVE-2026-6967 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-6967?
Check the references section above for vendor advisories and patch information. Affected products include: Amazon Tough, Amazon Tuftool.