CVE-2026-112935
filelock: SoftFileLock stale-lock break removes a live lock file on a reused inode number and admits two holders
- State
- Published
- Severity
- 4.7 Medium
- Published
- Oct 20, 2026
- Updated
- Oct 28, 2026
- Reserved
- Oct 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.7 Medium | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N | GitHub_M |
Weaknesses
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products
| Product | Versions |
|---|---|
filelocktox-dev |
|
References
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