Symlink Attack Affecting filelock package, versions [,3.20.3)
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-FILELOCK-14912448
- published11 Jan 2026
- disclosed10 Jan 2026
- creditGeorge Tsigourakos
Introduced: 10 Jan 2026
CVE-2026-22701 (opens in a new tab)How to fix?
Upgrade filelock to version 3.20.3 or higher.
Overview
Affected versions of this package are vulnerable to Symlink Attack via a race condition in the _acquire method. An attacker can cause lock operations to fail or behave unexpectedly by creating a symlink at the lock file path between the permission check and file creation.