# CVE-2026-112936: python-filelock: filelock is a platform-independent file lock for Python

CVE-2026-112936 is fixed in python-filelock on 1 platform by DEBIAN-CVE-2026-112936 (version 4.0.12-1), released October 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-112936
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 20, 2026

## Description

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-filelock Debian 14 | 4.0.12-1 | [DEBIAN-CVE-2026-112936](https://patchblox.com/security/data/fix/linux/debian-cve-2026-112936.md) | Oct 21, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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