What is CVE-2026-112937?

CVE-2026-112937 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.1/10. Published 2026-10-20.

How severe is CVE-2026-112937?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Tox-Dev Filelock

CVE-2026-112937

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, ReadWriteLock can remove a randomized .filelock-* private-hard-link directory during cleanup, allowing another local user with rename access in a non-sticky parent to observe a live name or forge a dead-owner sweep name and rename a sibling directory onto it for deletion. This issue is fixed in version 4.2.1.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2026-10-20.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Tox-Dev Filelock — versions >= 4.1.0, < 4.2.1

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

Frequently asked questions

What is CVE-2026-112937?: CVE-2026-112937 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.1/10. Published 2026-10-20.
How severe is CVE-2026-112937?: Medium severity. CVSS v3 base score is 6.1 out of 10.