CVE-2026-112934
mediumfilelock is a platform-independent file lock for Python.
Vendor / product: Tox-dev — filelock
filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes holder records by name, allowing another local user with rename access to the lock directory to replace a record with a named pipe and stall the lock, or under a permissive hard-link policy to link a reachable target file and cause the lock user to write through it. This issue is fixed in version 4.2.1.
CVSS
6.1
6.1 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-10-20 15:17
Modified: 2026-10-22 22:18
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:04 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
tox-dev / filelock ≥4.0.0 <4.2.1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03
Patch / mitigation: https://github.com/tox-dev/filelock/pull/842
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845
References
- https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03 security-advisories@github.com
- https://github.com/tox-dev/filelock/pull/842 security-advisories@github.com
- https://github.com/tox-dev/filelock/releases/tag/4.2.1 security-advisories@github.com
- https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845 security-advisories@github.com
- https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:04 UTC · record ↗