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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d Patch
- https://github.com/tox-dev/filelock/pull/834 Patch
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8 Exploit, Mitigation, Patch, Vendor Advisory
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8 Exploit, Mitigation, Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 8
- StatusAnalyzed → ModifiedNVD modified 2026-10-22 22:18
- CwesCWE-363 → CWE-363, CWE-59NVD modified 2026-10-21 18:00
- Cpes+1 CPE criteria (now 1)NVD modified 2026-10-21 18:00
- StatusPublished → AnalyzedNVD modified 2026-10-21 18:00
- StatusUndergoing Analysis → PublishedNVD modified 2026-10-20 14:41
- StatusPublished → Undergoing AnalysisNVD modified 2026-10-20 19:50
- StatusReceived → PublishedNVD modified 2026-10-20 14:41
- First seenCVSS 7.1NVD modified 2026-10-20 15:17
Affected (CPE criteria) 1
cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*
References 5
- https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d Patch
- https://github.com/tox-dev/filelock/pull/834 Patch
- https://github.com/tox-dev/filelock/releases/tag/4.2.1 Release Notes
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8 Exploit, Mitigation, Patch, Vendor Advisory
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8 Exploit, Mitigation, Patch, Vendor Advisory