Time-of-check Time-of-use (TOCTOU) Affecting python-filelock package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Oct 2026
- disclosed20 Oct 2026
Introduced: 20 Oct 2026
NewCVE-2026-112937 (opens in a new tab)How to fix?
There is no fixed version for Debian:unstable python-filelock.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-filelock package and not the python-filelock package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-112937
- https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d
- https://github.com/tox-dev/filelock/pull/834
- https://github.com/tox-dev/filelock/releases/tag/4.2.1
- https://github.com/tox-dev/filelock/security/advisories/GHSA-jqc4-5cvw-7w85