CVE-2026-112939
MEDIUM
CVSS 4.7
Published: 2026-10-20
Modified: 2026-10-21
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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.
Quick Facts
| CVE ID | CVE-2026-112939 |
| CVSS Score | 4.7 |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N |
| Published | 2026-10-20 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
Affected Products
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tox-dev / filelock