CVE-2026-112937

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, ReadWriteLock can remove a randomized .filelock-* private-hard-link directory during cleanup, allowing another local user with rename access in a non-sticky parent to observe a live name or forge a dead-owner sweep name and rename a sibling directory onto it for deletion. This issue is fixed in version 4.2.1.

• CWE-367

• https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2dPatch
• https://github.com/tox-dev/filelock/pull/834Patch
• https://github.com/tox-dev/filelock/releases/tag/4.2.1Release Notes
• https://github.com/tox-dev/filelock/security/advisories/GHSA-jqc4-5cvw-7w85Exploit, Mitigation, Patch, Vendor Advisory

Published

Oct 20, 2026

Last Modified

Oct 21, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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