Buffer overflow in Microsoft Windows_11_24h2
CVE-2026-42896
Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
Vulnerability class: Buffer Overflow
EPSS: 0.001 (21.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows_11_24h2
- Microsoft Windows_11_25h2
- Microsoft Windows_11_26h1
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
- Microsoft Windows 11 Version 26h1 — versions 10.0.28000.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows_server_2025
- Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0
Weakness classification (CWE)
References
- Windows DWM Core Library Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42896?
- CVE-2026-42896 is a high-severity vulnerability in Microsoft Windows_11_24h2, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-05-12.
- How severe is CVE-2026-42896?
- High severity. CVSS v3 base score is 7.8 out of 10.