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.
Published: 2026-10-20
Score: 6.1 Medium
EPSS: n/a
KEV: No
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History

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'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

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

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

Link: CVE-2026-112909

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-112909

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-706

    Use of Incorrectly-Resolved Name or Reference