CVE-2026-112907

2.5 LOW 0.1% exploit odds Fix listed Denial of service Library

What it is

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, soft lock classes on Windows read an existing marker with _read_lock_file and remove a stale marker through break_lock_file using pathname operations that wait for an oplock break. Another local account with read access to an unheld marker can keep a Level 1 or batch oplock unanswered, causing SoftFileLock.acquire and related async or fallback locks to wait beyond timeout, blocking=False, and cancel_check. A stale marker under the oplock cannot be broken, but mutual exclusion remains intact and no file other than the marker is accessed. This issue is fixed in version 4.2.1.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. Limited direct impact.
Exploit odds: 0.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-11-05 22:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-11-10 05:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.1% in the next 30 days (EPSS).
Severity: 2.5 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-11-05 22:17 UTC
Last modified: 2026-11-10 05:17 UTC
Exploit probability: 0.1% · EPSS, next 30 days
Weakness: CWE-667
Record status: Awaiting Analysis

Attack profile CVSS 3.1 · 2.5

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Raw vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record