CVEvulnerability
CVE-2026-112939
4.7 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-10-20
- Last modified
- 2026-10-21
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-345
Description
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1.
Affected configurations
• tox-dev filelock (>= 3.22.0 < 4.2.1)
Related
Weakness · CWE (1)
- CWE-345 Insufficient Verification of Data Authenticity weakness
References
- https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc Patch
- https://github.com/tox-dev/filelock/pull/836 Patch
- https://github.com/tox-dev/filelock/releases/tag/4.2.1 Release Notes
- https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4 Exploit, Mitigation, Patch, Vendor Advisory
- https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4 Exploit, Mitigation, Patch, Vendor Advisory