CVE-2026-112936

filelock: ReadWriteLock follows a symlink at the lock path into SQLite

State: Published
Severity: 6.1 Medium
Published: Oct 20, 2026
Updated: Oct 20, 2026
Reserved: Oct 19, 2026

Description

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L	GitHub_M

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')
CWE-668 Exposure of Resource to Wrong Sphere

Affected Products

Product	Versions
filelocktox-dev	>= 3.20.4, < 4.0.9Affected

References

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