CVE-2026-112936CWE-59CWE-668

CVE-2026-112936

Medium · published October 20, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
13.3
In the wild
Unconfirmed
What it is

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9.

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:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00232 · 13.3th percentile
Weaknesses
CWE-59 · Improper Link Resolution Before File Access ('Link Following'); CWE-668 · Exposure of Resource to Wrong Sphere
Published
2026-10-20T19:17Z
Affected products (1)
ProductVersionsFixed in
tox-dev/filelock≥ 3.20.4, < 4.0.94.0.9
References (4)
https://github.com/tox-dev/filelock/commit/4d45e83caf7e31f9a12fb44526bdc07f70114f04 · [email protected]https://github.com/tox-dev/filelock/releases/tag/4.0.9 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 14:34Z
    filelock: ReadWriteLock follows a symlink at the lock path into SQLite
    cvelistv5
  • 20 OCT 14:34Z
    filelock: ReadWriteLock follows a symlink at the lock path into SQLite
    cvelistv5