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CVE-2026-112941 Details

Description

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftReadWriteLock and AsyncSoftReadWriteLock cache a successful check of the <path>.rw lock tree and resolve its names again during later record operations, allowing another local user who can replace that tree after the first acquisition to redirect lock-record writes into directories writable by the lock user. This issue is fixed in version 4.2.1.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.3 LOWVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/tox-dev/filelock/security/advisories/GHSA-wfhq-q4j2-c37m	CISA-ADP	ExploitMitigationPatchVendor Advisory
https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03	[email protected]	Patch
https://github.com/tox-dev/filelock/pull/842	[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-wfhq-q4j2-c37m	[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 28, 2026	CVE Modified	CISA-ADP
Oct 21, 2026	Initial Analysis	[email protected]
Oct 20, 2026	New CVE Received	[email protected]