Threat Intelligence / CVE / CVE-2026-47291

CVE-2026-47291 — Microsoft Windows 10 Version 1607

CVSS v3.1 9.8 (CRITICAL) · EPSS 21.5% (higher than 97.3% of all scored CVEs) · Priority 8.8/10 · Published 2026-06-09

As of 2026-07-15, CVE-2026-47291 is a CRITICAL-severity vulnerability in Microsoft Windows 10 Version 1607, CVSS v3.1 9.8, EPSS 21.5% (97.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-47291, most recently “CVE-2026-47291: Remote Code Execution in Windows HTTP.sys (Kernel-Mode Integer Overflow)”.

Last updated: 2026-07-15

What is CVE-2026-47291?

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

The record classifies CVE-2026-47291 under weakness classes CWE-190, CWE-122. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 95 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST): 21.5% probability of exploitation in the next 30 days, higher than 97.3% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 8.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-06-09, last modified 2026-07-15

Is CVE-2026-47291 being exploited?

No public exploitation evidence for CVE-2026-47291 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-15. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

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, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2

How to fix CVE-2026-47291

Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47291. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-47291

1 tracked threat in the Threadlinqs corpus references CVE-2026-47291, either in the campaign’s CVE list or as an indicator on the campaign record.

CVE-2026-47291: Remote Code Execution in Windows HTTP.sys (Kernel-Mode Integer Overflow) — CRITICAL · 2026-07-19

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-20. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

msrc.microsoft.com — vendor advisory

Full detection coverage & IOCs for threats exploiting CVE-2026-47291 are available via the Threadlinqs MCP server (Purple tier). View plans →

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