What is CVE-2026-50420?

CVE-2026-50420 is a medium-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Out-of-bounds Read. CVSS score: 6.2/10. Published 2026-07-14.

How severe is CVE-2026-50420?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Out-of-bounds Read in Microsoft Windows 11 Version 24h2

CVE-2026-50420

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to disclose information locally.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2026-50420?: CVE-2026-50420 is a medium-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Out-of-bounds Read. CVSS score: 6.2/10. Published 2026-07-14.
How severe is CVE-2026-50420?: Medium severity. CVSS v3 base score is 6.2 out of 10.