CVE-2026-112936
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductTox-dev Filelock
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-59Improper link resolutionCWE-668CWE-668
How to fix
Update
- tox-dev filelock4.0.9 or later
- filelock4.0.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| tox-dev filelock | 3.20.4 ≤ v < 4.0.9 | 4.0.9 |
| filelockPyPI | 3.20.4 ≤ v ≤ 4.0.8 | 4.0.9 |
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