CVE-2026-6966

HIGH EPSS 17.5%
Published Apr 24, 20262mo ago · Modified Jun 17, 20262w ago
7.0 CVSS 4.0
High
Find Similar
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.0
Exploitability
—
Impact
—
Vector string
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
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
17.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-347

Affected Products 2

VendorProductVersionRange
amazontough* <0.22.0
amazontuftool* <0.15.0

References 6

  • aws.amazon.com https://aws.amazon.com/security/security-bulletins/2026-019-aws/
    Vendor Advisory
  • crates.io https://crates.io/crates/tough/0.22.0
    Product
  • crates.io https://crates.io/crates/tuftool/0.15.0
    Product
  • github.com https://github.com/awslabs/tough/releases/tag/tough-v0.22.0
    Release Notes
  • github.com https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0
    Release Notes
  • github.com https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.