What is CVE-2026-50501?

CVE-2026-50501 is a high-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-07-14.

How severe is CVE-2026-50501?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Microsoft Windows 11 Version 24h2

CVE-2026-50501

Stack-based buffer overflow in Windows Resilient File System (ReFS) 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 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 (Server Core Installation) — versions 10.0.26100.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-50501?: CVE-2026-50501 is a high-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-07-14.
How severe is CVE-2026-50501?: High severity. CVSS v3 base score is 7.8 out of 10.