MEDIUM 4.7 NVD
CVE-2026-112939
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacke
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1.
References
- https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc
- https://github.com/tox-dev/filelock/pull/836
- https://github.com/tox-dev/filelock/releases/tag/4.2.1
- https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4
- https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4
This medium severity vulnerability with a CVSS score of 4.7 was published on 2026-10-20 via NVD.
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