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CVE-2026-112935 Details

Description

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. This issue is fixed in version 4.2.1.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.7 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/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-fq56-3cx3-fjxp	CISA-ADP	ExploitMitigationPatchVendor Advisory
https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b	[email protected]	Patch
https://github.com/tox-dev/filelock/pull/843	[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-fq56-3cx3-fjxp	[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	>= 3.22.0, < 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]