Medium 5.3Published Oct 20, 2026

CVE-2026-112914filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory

Updated under an hour ago (Oct 28, 2026, 7:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for tox-dev filelock

Exploited in the last 30 days

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a stale marker by name after moving it aside, allowing another local user with rename access in a non-sticky lock directory to swap in a symbolic link and, on a runtime that follows the link and a same-filesystem target, make the lock user hard-link one of its files into the lock directory. This issue is fixed in version 4.2.1.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness (CWE): CWE-363
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 20, 2026

Affected products

Affected products

tox-dev filelock tox_dev:filelock (from the name)	from 4.1.0, < 4.2.1	CNA record
tox-dev filelock tox-dev:filelock	from 4.1.0 before 4.2.1	NVD

References

References

https://github.com/tox-dev/filelock/security/advisories/GHSA-crv4-6mhj-j5jh	x-refsource-confirm, exploit, mitigation, patch, vendor-advisory
https://github.com/tox-dev/filelock/pull/843	x-refsource-misc, patch
https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b	x-refsource-misc, patch
https://github.com/tox-dev/filelock/releases/tag/4.2.1	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.