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    CVE-2026-112939

    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.

    Published:Oct 20, 2026
    Last Modified:Oct 21, 2026
    EPS:Oct 20, 2026
    EPSS Score:0.00135
    CVSS Score:4.7

    Affected Products

    Vendor
    Tox-dev
    Product
    Filelock

    Exploits

    https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4

    Related CVEs

    CVE-2026-112941 (CVSS 3.3) — filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftReadWriteLock and AsyncSo…
    CVE-2026-112940 (CVSS 7.1) — filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock let SQLite reo…
    CVE-2026-112937 (CVSS 6.1) — filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, ReadWriteLock can remove a ra…
    CVE-2026-112936 (CVSS 6.1) — filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadW…
    CVE-2026-112935 (CVSS 4.7) — filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a sta…
    CVE-2026-112934 (CVSS 6.1) — filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes h…
    CVE-2026-112915 (CVSS 5.5) — filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock can open a cra…
    CVE-2026-112914 (CVSS 5.3) — filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a st…
    CVE-2026-112912 (CVSS 2.5) — filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a sw…
    CVE-2026-112911 (CVSS 6.3) — filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High