CVE-2026-112934CWE-62

CVE-2026-112934

Medium · published October 20, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
3.2
In the wild
Unconfirmed
What it is

filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes holder records by name, allowing another local user with rename access to the lock directory to replace a record with a named pipe and stall the lock, or under a permissive hard-link policy to link a reachable target file and cause the lock user to write through it. This issue is fixed in version 4.2.1.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00142 · 3.2th percentile
Weakness
CWE-62 · UNIX Hard Link
Published
2026-10-20T19:17Z
Affected products (1)
ProductVersionsFixed in
tox-dev/filelock≥ 4.0.0, < 4.2.14.2.1
References (5)
https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03 · [email protected]https://github.com/tox-dev/filelock/pull/842 · [email protected]https://github.com/tox-dev/filelock/releases/tag/4.2.1 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 14:30Z
    filelock: SoftReadWriteLock holder refresh writes through a hard link and hangs on a named pipe that another local user renames over its record
    cvelistv5
  • 20 OCT 14:30Z
    filelock: SoftReadWriteLock holder refresh writes through a hard link and hangs on a named pipe that another local user renames over its record
    cvelistv5