CVE-2026-112914
filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-363 |
| Vendor | tox-dev |
| Product | filelock |
| Published | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None
Affected Versions
tox-dev / filelock
>= 4.1.0, < 4.2.1
References
github.com: https://github.com/tox-dev/filelock/security/advisories/GHSA-crv4-6mhj-j5jh github.com: https://github.com/tox-dev/filelock/pull/843 github.com: https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b github.com: https://github.com/tox-dev/filelock/releases/tag/4.2.1