CVE-2026-112939

MediumCVSS 4.7/10Last modified Oct 21, 2026

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-345

Affected software

No affected versions have been published.

Timeline

Published: Oct 20, 2026
Last modified: Oct 21, 2026
NVD status: Analyzed

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