CVE-2026-112908
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
26/100
Published: 2026-11-05
Modified: 2026-11-10
First seen: 2026-11-05
Status: active
Attack Surface
No Interaction
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
High
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
High
A:
Low
Description
filelock is a platform-independent file lock for Python. From version 3.30.0 until version 4.2.1, StrictSoftFileLock and AsyncStrictSoftFileLock on POSIX systems create coordination and claim directories without applying the caller’s restrictive lock mode. A permissive umask or inherited default ACL can leave these directories writable by another local user, allowing that user to delete an active holder’s claims. Another authorized process can then acquire the lock while the original holder remains in its critical section. An attacker can also plant malformed claims to prevent acquisition. This issue is fixed in version 4.2.1.