CVE-2026-62811: Windows HTTP.sys Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
Other sources
Windows HTTP.sys Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5499Fixed in 10.0.20348.5440Patch KB5120229 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2704Patch KB5121000 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33296Fixed in 10.0.26100.33222Patch KB5120228 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9168Fixed in 10.0.26200.9106Patch KB5120994 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9168Fixed in 10.0.26100.9106Patch KB5120994 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7517Patch KB5120240
Event History
Frequently Asked Questions
What is the severity of CVE-2026-62811?
CVE-2026-62811 has a high severity rating of 7.8.
How do I fix CVE-2026-62811?
To fix CVE-2026-62811, apply the available security patch from Microsoft.
What type of vulnerability is CVE-2026-62811?
CVE-2026-62811 is a heap-based buffer overflow vulnerability.
Which software is affected by CVE-2026-62811?
CVE-2026-62811 affects various versions of Microsoft Windows 11 and Windows Server 2022 and 2025.
Can CVE-2026-62811 be exploited remotely?
No, CVE-2026-62811 requires local access for exploitation.