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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-6967

23
FAUCET Score

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.

First published: Apr 24, 2026Last modified: Apr 24, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.9.0, < 0.22.0CPE matchmatch criteria
cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:*
< 0.15.0CPE matchmatch criteria
cpe:2.3:a:amazon:tuftool:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 4.0

7.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
HIGH
SS Availability
LOW
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.25%
Probability of exploitation in next 30 days
EPSS Percentile
16.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0025 is in the 19th percentile among its peer group of 21,957 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

rustpatch availablevia ghsa
Product: toughFixed in: 0.22.0
rustpatch availablevia ghsa
Product: tuftoolFixed in: 0.15.0
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

rustGHSA-4v58-8p28-2rq3high

awslabs/tough is Missing Delegated Metadata Validation

May 5, 2026

References

aws.amazon.com / security/security-bulletins/2026-019-aws
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
github.com / awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3
Vendor Advisory