CVE-2026-47291
This vulnerability is an integer overflow in Windows HTTP.sys that lets an attacker run code on a target machine over the network. It affects many recent Windows 10 and Windows 11 releases. The flaw can be triggered without authentication or user interaction.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Microsoft Windows 10 (1607, 1809, 21H2, 22H2) and Windows 11 (23H2, 24H2, 25H2) versions are affected.
Real-world impact
An attacker could run arbitrary code on the affected system, potentially taking full control, stealing data, or installing malware.
Why this severity
The CVSS score of 9.8 reflects that the flaw is exploitable from the network, requires no privileges, and can compromise confidentiality, integrity, and availability. The high impact and low effort make it critical.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jun 9, 2026 · Jun 9, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 23, 2026 · 12d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- msrc.microsoft.com/update-guide/vulnerability/…vendor advisory