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CVE-2026-112941

CVE-2026-112941 · filelock: SoftReadWriteLock follows a lock tree swapped in after its first acquire and writes lock records into directories of the user running the lock

This page contains facts from public vulnerability sources. Check the original advisory before updating.

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftReadWriteLock and AsyncSoftReadWriteLock cache a successful check of the <path>.rw lock tree and resolve its names again during later record operations, allowing another local user who can replace that tree after the first acquisition to redirect lock-record writes into directories writable by the lock user. This issue is fixed in version 4.2.1.

CVSS 3.3 · Low · EPSS 0.1%

Published
Updated

Stack: system

Affected products and versions

  • filelock

    Versions
    • >= 4.1.0, < 4.2.1: Affected

    No fix published

  • python-filelock Debian:12

    Versions
    • 3.12.2-1
    • 3.12.3-1
    • 3.12.4-1
    • 3.13.1-1
    • 3.13.3-1
    • 3.13.4-1
    • 3.14.0-1
    • 3.15.4-1
    • 3.16.1-1
    • 3.16.1-2
    • 3.17.0-1
    • 3.18.0-1
    • 3.19.1-1
    • 3.20.0-1
    • 3.20.2-1
    • 3.20.3-1
    • 3.24.3-1
    • 3.25.0-1
    • 3.25.2-1
    • 3.29.0-1
    • 3.29.4-1
    • 3.29.5-1
    • 3.29.7-1
    • 3.32.0-1
    • 3.32.2-1
    • 3.32.4-1
    • 3.32.4-2
    • 3.32.5-1
    • 3.32.6-1
    • 3.9.0-1
    • 3.9.0-1+deb12u1
    • 4.0.1-1
    • 4.0.12-1
    • 4.1.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Debian:13

    Versions
    • 3.18.0-1
    • 3.18.0-1+deb13u1
    • 3.19.1-1
    • 3.20.0-1
    • 3.20.2-1
    • 3.20.3-1
    • 3.24.3-1
    • 3.25.0-1
    • 3.25.2-1
    • 3.29.0-1
    • 3.29.4-1
    • 3.29.5-1
    • 3.29.7-1
    • 3.32.0-1
    • 3.32.2-1
    • 3.32.4-1
    • 3.32.4-2
    • 3.32.5-1
    • 3.32.6-1
    • 4.0.1-1
    • 4.0.12-1
    • 4.1.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Debian:14

    Versions
    • 3.18.0-1
    • 3.19.1-1
    • 3.20.0-1
    • 3.20.2-1
    • 3.20.3-1
    • 3.24.3-1
    • 3.25.0-1
    • 3.25.2-1
    • 3.29.0-1
    • 3.29.4-1
    • 3.29.5-1
    • 3.29.7-1
    • 3.32.0-1
    • 3.32.2-1
    • 3.32.4-1
    • 3.32.4-2
    • 3.32.5-1
    • 3.32.6-1
    • 4.0.1-1
    • 4.0.12-1
    • 4.1.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Ubuntu:Pro:18.04:LTS

    Versions
    • 2.0.11-1
    • 2.0.12-1
    • 2.0.13-1
    • 3.0.0-2
    • 3.0.3-1
    • 3.0.4-1
    • 3.0.4-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Ubuntu:Pro:20.04:LTS

    Versions
    • 3.0.12-1
    • 3.0.12-2
    • 3.0.12-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Ubuntu:Pro:22.04:LTS

    Versions
    • 3.0.12-2
    • 3.3.2-1
    • 3.4.0-1
    • 3.4.2-1
    • 3.4.2-2
    • 3.6.0-1
    • 3.6.0-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Ubuntu:Pro:24.04:LTS

    Versions
    • 3.12.2-1
    • 3.12.4-1
    • 3.13.1-1
    • 3.13.1-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Ubuntu:26.10

    Versions
    • 3.20.3-1
    • 3.29.4-1
    • 3.32.0-1
    • 3.32.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-filelock Ubuntu:26.04:LTS

    Versions
    • 3.18.0-1
    • 3.20.0-1
    • 3.20.2-1
    • 3.20.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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