CVE-2026-112935filelock: SoftFileLock stale-lock break removes a live lock file on a reused inode number and admits two holders

Descripción

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. This issue is fixed in version 4.2.1.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/tox-dev/filelock/security/advisories/GHSA-fq56-3cx3-fjxp ExploitMitigationPatchVendor Advisory
• https://github.com/tox-dev/filelock/pull/843 Patch
• https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b Patch
• https://github.com/tox-dev/filelock/releases/tag/4.2.1 Release Notes