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CVE-2026-112937 Details

Description

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, ReadWriteLock can remove a randomized .filelock-* private-hard-link directory during cleanup, allowing another local user with rename access in a non-sticky parent to observe a live name or forge a dead-owner sweep name and rename a sibling directory onto it for deletion. This issue is fixed in version 4.2.1.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d	[email protected]	Patch
https://github.com/tox-dev/filelock/pull/834	[email protected]	Patch
https://github.com/tox-dev/filelock/releases/tag/4.2.1	[email protected]	Release Notes
https://github.com/tox-dev/filelock/security/advisories/GHSA-jqc4-5cvw-7w85	[email protected]	ExploitMitigationPatchVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-367	Time-of-check Time-of-use (TOCTOU) Race Condition	[email protected]

Affected Products

Product	Versions
tox-dev filelock	>= 4.1.0, < 4.2.1
CPE cpe:2.3:a:tox-dev:filelock::::::python::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 21, 2026	Initial Analysis	[email protected]
Oct 21, 2026	CVE Modified	CISA-ADP
Oct 20, 2026	New CVE Received	[email protected]