CVE-2026-112906CWE-694

CVE-2026-112906

Medium · published October 20, 2026

CVSS v3.1
4.7
EPSS
0%
Percentile
10.0
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 versions from 4.1.0 can reuse a stale observation when an attacker pre-dates and removes its own marker, at least two lock-user processes are waiting, coarse or matching modification times preserve the observation, and an honest contender creates a fresh marker on the reused inode, causing that live marker to be removed as stale. This issue is fixed in version 4.2.1.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00205 · 10.0th percentile
Weakness
CWE-694 · Use of Multiple Resources with Duplicate Identifier
Published
2026-10-20T19:17Z
References (4)
https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b · [email protected]https://github.com/tox-dev/filelock/releases/tag/4.2.1 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2 · [email protected]https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 14:09Z
    filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre-dated file passed on through inode reuse
    cvelistv5
  • 20 OCT 14:09Z
    filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre-dated file passed on through inode reuse
    cvelistv5