CVE-2026-112915

filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout

Published Oct 20, 2026 CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-cwqr-hh33-gh44 filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout
History
Type Values Removed Values Added
CPEs cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*
Type Values Removed Values Added
First Time appeared Tox-dev
Tox-dev filelock
Vendors & Products Tox-dev
Tox-dev filelock
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 20, 2026, 3:25 PM
Reserved
Oct 19, 2026, 8:16 PM
Status
Analyzed
Published
Oct 20, 2026, 3:17 PM
Modified
Oct 21, 2026, 9:15 PM
Severity
Moderate
Public date
Oct 20, 2026, 2:28 PM