CVE-2026-112941

The filelock Python library versions 4.1.0 through 4.2.1 are vulnerable to a Time-of-check Time-of-use (TOCTOU) race condition involving SoftReadWriteLock and AsyncSoftReadWriteLock . The vulnerability occurs because these components cache a successful check of the .rw lock tree but re-resolve na...

CVE-2026-112941 filelock: SoftReadWriteLock follows a lock tree swapped in after its first acquire and writes lock records into directories of the user running the lock

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftReadWriteLock and AsyncSoftReadWriteLock cache a successful check of the .rw lock tree and resolve its names again during later record operations, allowing another local user who can replace that tree after the...