CVE-2026-112936: filelock Resource Exposure

Description

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9.

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CVSS v3.1 Score

6.1

MEDIUM

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

EPSS — Exploit Prediction

0.0023

Probability of exploitation

0.14%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-59 CWE-59

CWE-668 CWE-668

Affected Products

Vendor	Product	Versions
tox-dev	filelock	3.20.4 — 4.0.9

References

Advisories & Patches

https://github.com/tox-dev/filelock/commit/4d45e83caf7e31f9a12fb44526bdc07f70114f04 https://github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56 https://github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56

Exploits

https://github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56 https://github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56

Other References

https://github.com/tox-dev/filelock/releases/tag/4.0.9

Frequently Asked Questions

What is CVE-2026-112936? +

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-112936? +

CVE-2026-112936 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0023, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-112936? +

CVE-2026-112936 affects products from tox-dev, specifically: filelock. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-112936? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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