Integer Overflow Vulnerability in Windows HTTP.sys by Microsoft

CVE-2026-47291

What is CVE-2026-47291?

CVE-2026-47291 is a critical integer overflow vulnerability located in the Windows HTTP.sys component, a part of Microsoft’s operating system stack that handles HTTP requests and responses. This vulnerability occurs when the application incorrectly handles integer values, leading to conditions that may allow an unauthorized attacker to execute arbitrary code remotely over a network. The severity of this flaw arises from its potential to compromise systems that rely on the HTTP.sys driver for network communication, opening avenues for attackers to bypass security and gain control over sensitive environments.

The implications of this vulnerability extend to numerous organizations employing Microsoft Windows servers, especially those relying on web services and applications that utilize the HTTP.sys component. If successfully exploited, this vulnerability could lead to unauthorized access, data manipulation, or even complete system compromise, significantly threatening the integrity and confidentiality of organizational data.

Potential impact of CVE-2026-47291

1. Remote Code Execution: The vulnerability enables unauthorized attackers to execute arbitrary code on affected systems, allowing for potentially full control over the compromised environment. This can facilitate a wide range of malicious activities, including data theft and the deployment of further exploitation tools.

2. Service Disruption: Exploiting this flaw could lead to service outages or disruptions in web-based applications and services, which can adversely affect business operations, customer trust, and overall service delivery.

3. Increased Malware Propagation: Given the nature of the vulnerability, it may allow for the installation of malware, including ransomware, on affected systems. This can lead to cascading security incidents that threaten data integrity and operational continuity, as well as increased recovery costs and reputational damage.

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