CVE-2026-112935 | BDVDB-2026-393148 Detail

tox-devfilelock

Description#

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. This issue is fixed in version 4.2.1.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact high, availability impact none. Attack vector: local.

Weaknesses#

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

References#

Exploit#

No public exploit known

History#

Version 12026-10-20Record published in the CVE List.
Version 22026-10-28Most recent update recorded in the CVE List.

Published

Published: 2026-10-20
Last modified: 2026-10-28

Vendor information

Vendor: tox-dev
Product: filelock

All tox-dev vulnerabilities

Score

4.7 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 2.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Race Condition

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 3.22.0, < 4.2.1
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.7 Medium

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Metric breakdown
Attack Vector	Local
Attack Complexity	High
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).