File Lock Vulnerability in Tox Dev Python Library
CVE-2026-112937

6.1MEDIUM

Key Information:

Vendor

Tox-dev

Status
Filelock
Vendor
CVE Published:
20 October 2026

What is CVE-2026-112937?

The filelock library in Python allows for platform-independent file locking. Versions 4.1.0 to 4.2.1 contain a vulnerability in the ReadWriteLock functionality, enabling a local user with rename permissions in a non-sticky parent directory to potentially view an active filename or create a misleading dead-owner sweep name. This could lead to unauthorized file deletions through renaming sibling directories, raising serious security concerns. The issue is addressed in version 4.2.1.

Affected Version(s)

filelock >= 4.1.0, < 4.2.1

References

https://github.com/tox-dev/filelock/security/advisories/G...
x_refsource_CONFIRM
https://github.com/tox-dev/filelock/pull/834
x_refsource_MISC
https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17...
x_refsource_MISC

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.