CVE-2026-112915: tox-dev filelock

CVSS 5.5 (medium) · published 2026-10-20

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock can open a crafted SQLite lock database without bounding schema and query work, allowing another local user who can replace the database to make acquisition stall or hang; versions from 3.20.4 expose this on initial per-instance opening, and versions from 3.30.0 repeat the exposure on every acquisition. This issue is fixed in version 4.2.1.

Affected products (NVD): tox-dev filelock

Fixed in (NVD): 4.2.1

Weakness: CWE-400

Source: NVD CVE-2026-112915

References

• https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d
• https://github.com/tox-dev/filelock/pull/834
• https://github.com/tox-dev/filelock/releases/tag/4.2.1
• https://github.com/tox-dev/filelock/security/advisories/GHSA-cwqr-hh33-gh44
• https://github.com/tox-dev/filelock/security/advisories/GHSA-cwqr-hh33-gh44

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.