AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2026-2636

MEDIUM · CVSS 5.5 EPSS 0.41%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2026-02-25 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 5.5. It affects Microsoft, Windows.

CVE
CVE-2026-2636
Severity
MEDIUM
CVSS
5.5
EPSS
0.41%
Microsoft Windows

Original NVD Description

This vulnerability is caused by a CWE‑159: "Improper Handling of Invalid Use of Special Elements" weakness, which leads to an unrecoverable inconsistency in the CLFS.sys driver. This condition forces a call to the KeBugCheckEx function, allowing an unprivileged user to trigger a system crash. Microsoft silently fixed this vulnerability in the September 2025 cumulative update for Windows 11 2024 LTSC and Windows Server 2025. Windows 25H2 (released in September) was released with the patch. Windows 1123h2 and earlier versions remain vulnerable.