Buffer overflow in Microsoft Windows 10 Version 21h2
CVE-2026-54124
Integer overflow or wraparound in Windows Terminal allows an unauthorized attacker to execute code locally.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- 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 2022 — versions 10.0.20348.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0
- Microsoft Windows Terminal For 10 — versions 1.0.0
- Microsoft Windows Terminal For 11 — versions 1.0.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-54124?
- CVE-2026-54124 is a high-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-07-14.
- How severe is CVE-2026-54124?
- High severity. CVSS v3 base score is 7.8 out of 10.