CVE-2026-70247: HTTP.sys Remote Code Execution Vulnerability
HTTP.sys Remote Code Execution Vulnerability
Other sources
Out-of-bounds read in Windows HTTP.sys allows an authorized attacker to execute code locally.
— 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 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this vulnerability?
The attacker must already be authorized on the affected system and have local access. The available data does not describe a remote, unauthenticated exploitation path.
What impact could successful exploitation have?
Successful exploitation could allow code execution and is rated as having high confidentiality, integrity, and availability impact. This means an attacker could potentially access data, alter data, and disrupt the affected system.
Which systems should be prioritized for review?
Review deployments of Microsoft Windows 10, Windows 11, Windows Server 2012 and 2012 R2, Windows Server 2016, 2019, 2022, and 2025. Prioritize systems where authorized local users or lower-privileged accounts could be abused to gain further control.