CVE WatchNov 5, 2026

CVE-2026-112908

filelock is a platform-independent file lock for Python. From version 3.30.0 until version 4.2.1, StrictSoftFileLock and AsyncStrictSoftF

CVSS

5.3

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 5, 2026 · Last modified: Nov 5, 2026 · CWE-732

EPSS · 30d

Not enough EPSS history yet.

Technical description

filelock is a platform-independent file lock for Python. From version 3.30.0 until version 4.2.1, StrictSoftFileLock and AsyncStrictSoftFileLock on POSIX systems create coordination and claim directories without applying the caller’s restrictive lock mode. A permissive umask or inherited default ACL can leave these directories writable by another local user, allowing that user to delete an active holder’s claims. Another authorized process can then acquire the lock while the original holder remains in its critical section. An attacker can also plant malformed claims to prevent acquisition. This issue is fixed in version 4.2.1.

Official references

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