CVE-2026-112934
filelock: SoftReadWriteLock holder refresh writes through a hard link and hangs on a named pipe that another local user renames over its record
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-62 |
| Vendor | tox-dev |
| Product | filelock |
| Published | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
tox-dev / filelock
>= 4.0.0, < 4.2.1
References
github.com: https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845 github.com: https://github.com/tox-dev/filelock/pull/842 github.com: https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03 github.com: https://github.com/tox-dev/filelock/releases/tag/4.2.1