CVE-2026-112910
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
36/100
Published: 2026-11-05
Modified: 2026-11-09
First seen: 2026-11-05
Status: active
Attack Surface
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
Low
I:
Low
A:
Low
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.
Weakness Classification (1)
Affected Software (2)
References & Advisories (5)
x_refsource_MISC
x_refsource_MISC
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM