CVE-2026-112934
Medium
Description
filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes holder records by name, allowing another local user with rename access to the lock directory to replace a record with a named pipe and stall the lock, or under a permissive hard-link policy to link a reachable target file and cause the lock user to write through it. This issue is fixed in version 4.2.1.
SeverityMedium
CVSS6.1
Exploit probability—
ProductTox-dev Filelock
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-62CWE-62
How to fix
Update
- tox-dev filelock4.2.1 or later
- filelock4.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| tox-dev filelock | 4.0.0 ≤ v < 4.2.1 | 4.2.1 |
| filelockPyPI | 4.0.0 ≤ v ≤ 4.2.0 | 4.2.1 |
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