Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 2.7%
CVSS Severity
CVSS v3 Score 4.7
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
Products affected by CVE-2026-112939
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cpe:2.3:a:tox-dev:filelock:3.22.0
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cpe:2.3:a:tox-dev:filelock:3.23.0
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cpe:2.3:a:tox-dev:filelock:3.24.0
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cpe:2.3:a:tox-dev:filelock:3.24.1
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cpe:2.3:a:tox-dev:filelock:3.24.2
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cpe:2.3:a:tox-dev:filelock:3.24.3
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cpe:2.3:a:tox-dev:filelock:3.24.4
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cpe:2.3:a:tox-dev:filelock:3.25.0