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CVE-2026-6966

24
FAUCET Score

Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature, causing the client to accept forged delegated role metadata. 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
< 0.22.0CPE 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

7.0HIGH

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/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
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
17.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 22nd 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-8m7c-8m39-rv4xhigh

awslabs/tough Delegated Roles have a Signature Threshold Bypass

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-8m7c-8m39-rv4x
Vendor Advisory