CVE-2026-96202 in Windows
Summary
by MITRE • 10/14/2026
Heap-based buffer overflow in Windows Raw Image Extension allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as a heap-based buffer overflow within the Microsoft Windows Raw Image Extension represents a critical security flaw that impacts systems processing raw image files, commonly associated with digital camera formats such as CR2, NEF, or ARW. This component is responsible for parsing and rendering these specific file types to allow users to view them natively without third-party software. The core technical issue stems from improper validation of input data during the memory allocation process. Specifically, when the extension processes a maliciously crafted raw image file, it fails to correctly verify the size or bounds of certain data structures before copying content into heap-allocated buffers. This lack of rigorous boundary checking allows an attacker to write more data than the allocated buffer can hold, resulting in adjacent memory being overwritten with arbitrary values.
The operational impact of this vulnerability is severe due to its potential for remote code execution without user interaction beyond opening a malicious file or viewing it within certain applications that utilize the Windows Image Acquisition service. An unauthorized attacker who successfully exploits this flaw can execute arbitrary code on the target system with the same privileges as the current user, which often includes administrative rights if the victim is logged in as an administrator. This capability enables the installation of malware, data theft, or complete compromise of the affected machine. The network aspect implies that while direct file access is typically required, scenarios involving shared drives, email attachments processed by preview panes, or web services displaying raw images can facilitate remote exploitation over a local area network or even across the internet if exposed through vulnerable applications.
From an industry standards perspective, this vulnerability aligns with CWE-120, which describes buffer copy without checking size limits, and more specifically CWE-787, indicating out-of-bounds write on heap memory. In terms of attack vectors mapped to the MITRE ATT&CK framework, exploitation typically falls under Tactic 6: Command and Control or Tactic 7: Discovery depending on post-exploitation activities, but the initial access vector is often categorized under Initial Access via Spearphishing Attachment if delivered through email, or Local Privilege Escalation if combined with other flaws. The heap-based nature of the overflow makes it particularly dangerous as modern operating systems employ various memory protection mechanisms like Data Execution Prevention and Address Space Layout Randomization; however, skilled attackers can use techniques such as return-oriented programming to bypass these defenses by chaining together small sequences of existing code in the process memory.
Mitigation strategies for this vulnerability primarily involve applying the latest security patches released by Microsoft that address the input validation logic within the Raw Image Extension component. Organizations should ensure that all workstations and servers are updated with cumulative updates or specific hotfixes targeting this flaw. In environments where immediate patching is not feasible, administrators can mitigate risk by disabling the Windows Photo Viewer preview handler for raw image formats through Group Policy settings or registry modifications to prevent automatic parsing of these files in untrusted contexts. Additionally, restricting user privileges and implementing application whitelisting can reduce the impact if an exploit attempt occurs, limiting the ability of malicious code to execute with elevated permissions. Regular security awareness training regarding suspicious email attachments and file sources remains a critical layer of defense against social engineering tactics used to deliver such exploits.