CVE-2026-62739: 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 10.0.22631.7517Patch KB5120240 - Upgrade
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Fixed in 10.0.26100.9168Fixed in 10.0.26000.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.17763.9115Patch KB5120238 - Upgrade
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Fixed in 10.0.28000.2704Patch KB5121000 - Upgrade
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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 10.0.26100.33296Fixed in 10.0.26100.33222Patch KB5120228 - Upgrade
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Fixed in 10.0.26200.9168Fixed in 10.0.26100.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.19045.7663Patch KB5120249 - Upgrade
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Fixed in 10.0.19044.7663Patch KB5120249 - Upgrade
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Fixed in 10.0.20348.5499Fixed in 10.0.20348.5440Patch KB5120229
Event History
Frequently Asked Questions
What is the severity of CVE-2026-62739?
The severity of CVE-2026-62739 is rated as high with a score of 7.8.
How does CVE-2026-62739 affect systems?
CVE-2026-62739 allows an authorized attacker to elevate privileges locally due to a heap-based buffer overflow in Windows HTTP.sys.
Which operating systems are impacted by CVE-2026-62739?
CVE-2026-62739 affects Microsoft Windows 11, Windows 10, Windows Server 2019, Windows Server 2025, and Windows Server 2022.
How do I mitigate CVE-2026-62739?
To mitigate CVE-2026-62739, it is recommended to apply the latest security updates provided by Microsoft for the affected Windows versions.
What type of vulnerability is CVE-2026-62739?
CVE-2026-62739 is classified as a buffer overflow vulnerability.