CVE-2026-112914
Medium
Description
filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a stale marker by name after moving it aside, allowing another local user with rename access in a non-sticky lock directory to swap in a symbolic link and, on a runtime that follows the link and a same-filesystem target, make the lock user hard-link one of its files into the lock directory. This issue is fixed in version 4.2.1.
SeverityMedium
CVSS5.3
Exploit probability—
ProductTox-dev Filelock
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-363CWE-363
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 | 4.1.0 ≤ v < 4.2.1 | 4.2.1 |
| filelockPyPI | 4.1.0 ≤ v < 4.2.1 | 4.2.1 |
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