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 breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
High
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
High
Availability (Subsequent System)
Low
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected products
- AWS / tough0.22.0 – 0.22.0
- AWS / tuftool0.15.0 – 0.15.0
References
- MISChttps://aws.amazon.com/security/security-bulletins/2026-019-aws/
- PATCHhttps://github.com/awslabs/tough/releases/tag/tough-v0.22.0
- PATCHhttps://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0
- MISChttps://crates.io/crates/tough/0.22.0
- MISChttps://crates.io/crates/tuftool/0.15.0
- VENDOR_ADVISORYhttps://github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3