CVE-2026-47291

HTTP.sys Remote Code Execution Vulnerability

Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.

Affected

Microsoft · Windows 10 Version 1607 · Windows 10 Version 1809 · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 version 23H2 · Windows 11 Version 23H2

CVSS v3.1 MICROSOFT

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.97% chance of exploitation in the next 30 days, 61st percentile

Published

2026-06-09

Updated

2026-09-24

Proof-of-concept exploits (1)

• dhmosfunk/CVE-2026-49160-CVE-2026-47291-HTTP.sys6★ · 2026-06-17

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47291

References

• CVE Record
• NVD entry

Related

• CVE-2023-25690
• CVE-2025-0411
• CVE-2026-49160