Home/CVE/Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0
CVE

CVE-2026-6967

Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0

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.

MEDIUM · CVSS 5.9 EPSS 0.00024
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-345Insufficient Verification of Data Authenticity
▤

Affected Products & Versions

2
amazon tough>= 0.9.0 and < 0.22.0
amazon tuftool< 0.15.0
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
crates.io tough HIGH fixed in 0.22.0
crates.io tuftool HIGH fixed in 0.15.0
▣

Scoring & Timeline

5.9
MEDIUM · CVSS v3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Apr 2026 · 08:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
aws-security2026-019-aws
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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