CVE-2026-112909 — filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path
filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual r…
Published: 2026-10-20 · CVSS: 6.1 · CVSS 3.1
filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7