What is CVE-2026-112939?

CVE-2026-112939 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.7/10. Published 2026-10-20.

How severe is CVE-2026-112939?

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

Vulnerability in Tox-Dev Filelock

CVE-2026-112939

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1.

Published 2026-10-20 · last modified 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-345 — Insufficient Verification of Data Authenticity

References

Frequently asked questions

What is CVE-2026-112939?: CVE-2026-112939 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.7/10. Published 2026-10-20.
How severe is CVE-2026-112939?: Medium severity. CVSS v3 base score is 4.7 out of 10.