CVSS 4.7 (medium) · published 2026-10-20
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. This issue is fixed in version 4.2.1.
Affected products (NVD): tox-dev filelock
Fixed in (NVD): 4.2.1
Weakness: CWE-367
Source: NVD CVE-2026-112935
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