CVE-2026-6966

April 24, 2026, 9:16 p.m.

7.0
Medium

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.

Product(s) Impacted

Vendor Product Versions
Awslabs
  • Tough
  • Tuftool
  • <0.22.0
  • <0.15.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-347
Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a awslabs tough <0.22.0 / / / / / / /
a awslabs tuftool <0.15.0 / / / / / / /

References

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

Tags

CWE-347
ff89ba41-3aa1-4d27-914a-91399e9639e5
2026-04-24
CVE-2026-6966

CVSS Score

7.0 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: HIGH
  • Attack Requirements: PRESENT
  • Privileges Required: LOW
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: HIGH
  • Availability Impact: NONE
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: April 24, 2026, 8:16 p.m.
Last Modified: April 24, 2026, 9:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

ff89ba41-3aa1-4d27-914a-91399e9639e5

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.