filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.
History

Tue, 27 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 21 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-367
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 20 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Tox-dev
Tox-dev filelock
Vendors & Products Tox-dev
Tox-dev filelock

Tue, 20 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Description filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.
Title filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path
Weaknesses CWE-706
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-20T14:16:02.317Z

Updated: 2026-10-22T21:25:25.906Z

Reserved: 2026-10-19T20:16:09.857Z

Link: CVE-2026-112909

cve-icon Vulnrichment

Updated: 2026-10-22T21:25:20.691Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-20T15:17:15.313

Modified: 2026-10-27T21:04:56.090

Link: CVE-2026-112909

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T14:16:02Z

Links: CVE-2026-112909 - Bugzilla