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CVE-2026-112907 Details

Description

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, soft lock classes on Windows read an existing marker with _read_lock_file and remove a stale marker through break_lock_file using pathname operations that wait for an oplock break. Another local account with read access to an unheld marker can keep a Level 1 or batch oplock unanswered, causing SoftFileLock.acquire and related async or fallback locks to wait beyond timeout, blocking=False, and cancel_check. A stale marker under the oplock cannot be broken, but mutual exclusion remains intact and no file other than the marker is accessed. This issue is fixed in version 4.2.1.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:2.5 LOWVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/tox-dev/filelock/commit/97d694a9a3ee1721d6c79a480174dfd9b060a080	[email protected]
https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a	[email protected]
https://github.com/tox-dev/filelock/pull/835	[email protected]
https://github.com/tox-dev/filelock/releases/tag/4.2.1	[email protected]
https://github.com/tox-dev/filelock/security/advisories/GHSA-567q-5qvw-pf92	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-667	Improper Locking	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes