CVE-2026-112939
Published:October 20, 2026
Updated:October 22, 2026
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1.
Affected Packages
filelock (CONDA):
Affected version(s) >=4.0.1 <4.2.1Fix Suggestion:
Update to version 4.2.1https://github.com/tox-dev/filelock.git (GITHUB):
Affected version(s) >=4.0.0 <4.2.1Fix Suggestion:
Update to version 4.2.1filelock (PYTHON):
Affected version(s) >=4.0.0 <4.2.1Fix Suggestion:
Update to version 4.2.1Related Resources (4)
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Contact UsCVSS v4
Base Score:
5.7
Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.7
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Insufficient Verification of Data Authenticity
EPSS
Base Score:
0.14