Heap-Based Buffer Overflow in Windows HTTP.sys Affects Microsoft Products

CVE-2026-62735

What is CVE-2026-62735?

CVE-2026-62735 is a security vulnerability identified in Windows HTTP.sys, a core component responsible for handling HTTP communications in Microsoft products. This vulnerability is classified as a heap-based buffer overflow, which occurs when data exceeds the buffer storage capacity, leading to potential corruption of adjacent memory. An attacker with local access can exploit this weakness to escalate privileges, potentially gaining higher levels of control over the affected systems. This elevation of privileges could result in unauthorized access to sensitive data, manipulation of system operations, and the potential for further exploitation of the system, which poses a significant risk to organizational security.

Potential impact of CVE-2026-62735

1. Privilege Escalation: The primary impact of this vulnerability is the ability for an authorized attacker to gain elevated privileges, allowing them to execute commands and access resources that are normally restricted. This could lead to unauthorized data manipulation or extraction.

2. Increased Attack Surface: The successful exploitation of this vulnerability could enable attackers to install malicious software or create backdoors, thereby expanding the attack surface of the organization. Such capabilities can facilitate further intrusions or system compromises.

3. System Integrity Compromise: Organizations could face a significant risk to the integrity of their systems and data due to the potential unauthorized actions made possible by this vulnerability. This can lead to data breaches, loss of sensitive information, and disruption of critical business operations.

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