# CVE-2026-6966

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## 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.

## Key facts

- **CVE ID:** CVE-2026-6966
- **Published:** 2026-04-24
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-347

## Affected products

- `amazon:tough`
- `amazon:tuftool`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6966

## Citation

> AI Analytics. CVE-2026-6966. Retrieved 2026-07-11 from https://api.ai-analytics.org/cve/CVE-2026-6966. Derived from NIST NVD. Licensed CC0.

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