Vulnerability Description
filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock let SQLite reopen the database and side files by name; on POSIX systems an attacker with rename access in a non-sticky parent can swap those names to cause overwrite or unlink operations, while a writable adjacent hot journal is additionally required for attacker-chosen content overwrites. This issue is fixed in version 4.2.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Tox-Dev | Filelock | >= 3.20.4, < 4.2.1 |
Related Weaknesses (CWE)
References
- https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81cPatch
- https://github.com/tox-dev/filelock/pull/834Patch
- https://github.com/tox-dev/filelock/releases/tag/4.2.1Release Notes
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8ExploitMitigationPatch
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8ExploitMitigationPatch
FAQ
What is CVE-2026-112940?
CVE-2026-112940 is a vulnerability with a CVSS score of 7.1 (HIGH). filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock let SQLite reopen the database and side files by name; on POSIX systems an attacker with rename access i...
How severe is CVE-2026-112940?
CVE-2026-112940 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-112940?
Check the references section above for vendor advisories and patch information. Affected products include: Tox-Dev Filelock.