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.
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History

Tue, 20 Oct 2026 14:45:00 +0000

Type Values Removed Values Added
Description 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.
Title filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-20T15:25:38.592Z

Reserved: 2026-10-19T20:16:09.858Z

Link: CVE-2026-112915

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-20T15:17:15.953

Modified: 2026-10-20T15:17:15.953

Link: CVE-2026-112915

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses