Improper Verification of Cryptographic Signature Affecting rfc3161-client package, versions [,1.0.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-RFC3161CLIENT-10558120
- published27 Jun 2025
- disclosed20 Jun 2025
- creditWilliam Woodruff
Introduced: 20 Jun 2025
CVE-2025-52556 (opens in a new tab)How to fix?
Upgrade rfc3161-client to version 1.0.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature. An attacker can bypass signature validation by introducing a timestamp response signature that chains to a trusted root, allowing acceptance of forged timestamp responses.