CVE-2026-112912
Low
Description
filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that follows the link to infer whether a chosen path exists and is writable from the observable acquisition result. This issue is fixed in version 4.2.1.
SeverityLow
CVSS2.5
Exploit probability12. percentile0.2%
ProductTox-dev Filelock
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-59Improper link resolution
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 | 3.32.6 ≤ v < 4.2.1 | 4.2.1 |
| filelockPyPI | 3.32.6 ≤ v ≤ 4.2.0 | 4.2.1 |
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