What is CVE-2026-112909?

CVE-2026-112909 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 6.1/10. Published 2026-10-20.

How severe is CVE-2026-112909?

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

Vulnerability in Tox-Dev Filelock

CVE-2026-112909

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.

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:L/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 < 4.2.1

Weakness classification (CWE)

CWE-706 — Use of Incorrectly-Resolved Name or Reference

References

Frequently asked questions

What is CVE-2026-112909?: CVE-2026-112909 is a medium-severity vulnerability in Tox-Dev Filelock, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 6.1/10. Published 2026-10-20.
How severe is CVE-2026-112909?: Medium severity. CVSS v3 base score is 6.1 out of 10.