CVE-2026-112911
mediumfilelock is a platform-independent file lock for Python.
Vendor / product: Tox-dev — filelock
filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol state and admit concurrent holders. This issue is fixed in version 4.2.1.
CVSS
6.3
6.3 (CVSS v3.1)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-10-20 15:17
Modified: 2026-10-28 16:17
NVD status: Modified
Last synced 14 hours ago
Verified against the source API 2026-10-28 16:34 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 ≥3.30.0 <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/839
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-9c4x-gm8v-wgc4
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-9c4x-gm8v-wgc4
References
- https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03 security-advisories@github.com
- https://github.com/tox-dev/filelock/pull/839 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-9c4x-gm8v-wgc4 security-advisories@github.com
- https://github.com/tox-dev/filelock/security/advisories/GHSA-9c4x-gm8v-wgc4 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 16:34 UTC · record ↗