What is CVE-2026-112935?

CVE-2026-112935 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.7/10. Published 2026-10-20.

How severe is CVE-2026-112935?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Tox-Dev Filelock

CVE-2026-112935

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. 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 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N.

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 >= 3.22.0, < 4.2.1

Weakness classification (CWE)

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

References

Frequently asked questions

What is CVE-2026-112935?: CVE-2026-112935 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.7/10. Published 2026-10-20.
How severe is CVE-2026-112935?: Medium severity. CVSS v3 base score is 4.7 out of 10.