Buffer overflow in Microsoft Windows_10_1607
CVE-2026-47291
Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
Vulnerability class: Buffer Overflow
EPSS: 0.228 (97.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows_10_1607
- Microsoft Windows_10_1809
- Microsoft Windows_10_21h2
- Microsoft Windows_10_22h2
- Microsoft Windows 10 Version 1607 — versions 10.0.14393.0
- Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- Microsoft Windows_11_23h2
- Microsoft Windows_11_24h2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-47291?
- CVE-2026-47291 is a critical-severity vulnerability in Microsoft Windows_10_1607, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-06-09.
- How severe is CVE-2026-47291?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-47291 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.