CVE-2026-112912
filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker
- State
- Published
- Severity
- 2.5 Low
- Published
- Oct 20, 2026
- Updated
- Oct 20, 2026
- Reserved
- Oct 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 2.5 Low | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N | GitHub_M |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
Affected Products
| Product | Versions |
|---|---|
filelocktox-dev |
|
References
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