CVE-2026-112911: CWE-283: Unverified Ownership in tox-dev filelock
Description
A vulnerability in the tox-dev filelock Python package versions from 3.30.0 up to but not including 4.2.1 allows a local user to adopt a protocol directory created by another user in a shared parent directory. This can lead to unauthorized alteration of protocol state and concurrent lock holders. The issue is fixed in version 4.2.1.
CVSS v3.1
Score 6.3medium
Affected software
tox-dev
filelock
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The filelock package for Python, used for platform-independent file locking, contains an unverified ownership vulnerability (CWE-283) affecting StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 through 4.2.0. This flaw allows a local user to take over a protocol directory created by another user within a shared parent directory, enabling them to modify the protocol state and allow multiple concurrent holders of the lock. The vulnerability is resolved in version 4.2.1.
Potential Impact
An attacker with local access can manipulate the protocol directory ownership, causing concurrent holders of a lock that should be exclusive. This can lead to integrity and availability impacts, as indicated by the CVSS vector (no confidentiality impact, but high integrity and availability impact).
Mitigation Recommendations
Upgrade to filelock version 4.2.1 or later, where this vulnerability is fixed. No other mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-19T20:16:09.858Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad77f652cdf04f65637ac0f
Added to database: 10/20/2026, 14:49:09 UTC
Last enriched: 10/20/2026, 15:03:44 UTC
Last updated: 10/20/2026, 15:28:32 UTC
Views: 3
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