CVE-2026-112939filelock: SoftFileLock removes a live holder's marker when another user forges the PID in a writable marker

Beschreibung

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.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4 ExploitMitigationPatchVendor Advisory
• https://github.com/tox-dev/filelock/pull/836 Patch
• https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc Patch
• https://github.com/tox-dev/filelock/releases/tag/4.2.1 Release Notes