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.
Affected products
amazon: tough; amazon: tuftool
References6
- aws.amazon.com/security/security-bulletins/2026-019-aws/ Vendor Advisory
- github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3 Vendor Advisory
- crates.io/crates/tough/0.22.0 Product
- crates.io/crates/tuftool/0.15.0 Product
- github.com/awslabs/tough/releases/tag/tough-v0.22.0 Release Notes
- github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 Release Notes
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - CVSS 4.0
-
7.1
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 17 · as of 13 November 2026
- CWE
- CWE-345
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