CVE WatchNov 5, 2026

CVE-2026-112910

filelock is a platform-independent file lock for Python. From 3.10.0 until 4.2.1, filelock on Windows ignores the mode argument for WindowsF

CVSS

5.3

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 5, 2026 · Last modified: Nov 5, 2026 · CWE-732

EPSS · 30d

Not enough EPSS history yet.

Technical description

filelock is a platform-independent file lock for Python. From 3.10.0 until 4.2.1, filelock on Windows ignores the mode argument for WindowsFileLock files and the ReadWriteLock SQLite database. A lock created with mode=0o600 receives the parent directory's inheritable ACL because _open_non_reparse_fd and _nt_open do not create an owner-only security descriptor. Another local account with inherited access can read holder metadata or the lock database, modify those files where the ACL permits writes, or take the byte-range lock after release and delay later acquisitions. UnixFileLock is not affected, and mutual exclusion between cooperating processes continues to hold. This issue is fixed in version 4.2.1.

Official references

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