CVE-2026-112939 — filelock: SoftFileLock removes a live holder's marker when another user forges the PID in a writable marker
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 …
Published: 2026-10-20 · CVSS: 4.7 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7