CVE-2026-112939

4.7 MEDIUMpublic exploit available

Published 2026-10-20 · Updated 2026-10-21

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD description

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.

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Weaknesses

CWE-345

Vendors

tox-dev

Products

filelock

Public exploit & PoC references

https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc[Patch]
https://github.com/tox-dev/filelock/pull/836[Patch]
https://github.com/tox-dev/filelock/releases/tag/4.2.1[Release Notes]
https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4[Exploit, Mitigation, Patch, Vendor Advisory]
https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4[Exploit, Mitigation, Patch, Vendor Advisory]

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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