CVE-2026-112914CWE-363CWE-59

CVE-2026-112914

Medium · published October 20, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
0.7
In the wild
Unconfirmed
What it is

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a stale marker by name after moving it aside, allowing another local user with rename access in a non-sticky lock directory to swap in a symbolic link and, on a runtime that follows the link and a same-filesystem target, make the lock user hard-link one of its files into the lock directory. This issue is fixed in version 4.2.1.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00097 · 0.7th percentile
Weaknesses
CWE-363 · Race Condition Enabling Link Following; CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-10-20T19:17Z
Affected products (1)
ProductVersionsFixed in
tox-dev/filelock≥ 4.1.0, < 4.2.14.2.1
References (4)
https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b · [email protected]https://github.com/tox-dev/filelock/pull/843 · [email protected]https://github.com/tox-dev/filelock/releases/tag/4.2.1 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-crv4-6mhj-j5jh · [email protected]
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 14:26Z
    filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory
    cvelistv5
  • 20 OCT 14:26Z
    filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory
    cvelistv5