CVE-2026-112906
mediumfilelock is a platform-independent file lock for Python.
Vendor / product: Tox-dev — filelock
filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock versions from 4.1.0 can reuse a stale observation when an attacker pre-dates and removes its own marker, at least two lock-user processes are waiting, coarse or matching modification times preserve the observation, and an honest contender creates a fresh marker on the reused inode, causing that live marker to be removed as stale. This issue is fixed in version 4.2.1.
CVSS
4.7
4.7 (CVSS v3.1)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-10-20 15:17
Modified: 2026-10-27 21:06
NVD status: Analyzed
Last synced 18 hours ago
Verified against the source API 2026-10-28 11:30 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 ≥4.1.0 <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/740ff666b62a88496c8d7394e4e6230605e4d62b
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2
References
- https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b 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-2g95-wg33-c5x2 security-advisories@github.com
- https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 11:30 UTC · record ↗