filelock: SoftFileLock removes a live holder's marker when another user forges the PID in a writable marker (tox-dev filelock)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.14 % · percentile 3 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-345 — Insufficient Verification of Data Authenticity
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N | GitHub_M |
| CVSS 3.1 | MEDIUM 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-rfpc-qcw5-3pc4 — filelock: SoftFileLock removes a live holder's marker when another user forges the PID in a writable marker
European references
- ENISA EUVD · EUVD-2026-105029
- GCVE · GCVE-0-2026-112939
Affected configurations (NVD CPE)
cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*≥ 3.22.0 < 4.2.1
Affected products
| Product | Versions |
|---|---|
| tox-dev · filelock | affected >= 3.22.0, < 4.2.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |