CVE-2026-87636 in Chrome
Summary
by MITRE • 09/09/2026
Type confusion in XML in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described involves a type confusion error within the XML parsing component of Google Chrome, specifically in versions prior to 153.0.8010.36. Type confusion is a critical class of memory safety vulnerabilities where an application incorrectly interprets the data type of a variable or object during runtime operations. In this context, the flaw resides in how the browser handles XML documents processed through its rendering engine. When a user visits a maliciously crafted HTML page containing specially constructed XML content, the parser fails to correctly validate or cast the internal representation of certain objects. This misinterpretation allows an attacker to manipulate memory structures in ways that were not intended by the developers, leading to undefined behavior within the browser's execution environment.
From a technical perspective, this flaw exploits weaknesses in how Chrome manages object types during XML parsing operations. The Chromium security team has classified this issue with a medium severity rating, indicating that while it is significant enough to warrant immediate attention and patching, it may require specific conditions or additional steps beyond simple exploitation of the type confusion itself to achieve full code execution. However, given that modern browsers operate within strict sandbox environments designed to isolate untrusted content from the host operating system, any breach of these boundaries represents a serious security incident. The ability to execute arbitrary code inside the sandbox suggests that an attacker could potentially bypass certain isolation mechanisms or leverage subsequent vulnerabilities in other browser components to escape the sandbox entirely and gain control over the underlying system.
The operational impact of this vulnerability is severe for end-users who rely on Chrome for secure web browsing. An attacker can distribute a malicious webpage via phishing emails, compromised websites, or drive-by downloads. Upon loading such a page, the victim's browser processes the crafted XML data, triggering the type confusion flaw. This could lead to remote code execution, allowing the installation of malware, theft of sensitive credentials stored in the browser, surveillance of user activity, or further lateral movement within a corporate network if the device is part of an enterprise environment. The medium severity classification reflects that while exploitation might not be trivial due to modern exploit mitigation techniques like ASLR and DEP, it remains feasible for determined attackers with sufficient resources.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 153.0.8010.36 or later immediately upon availability. This patch addresses the underlying memory management issues within the XML parser, ensuring proper type validation before operations are performed on objects. Additionally, security administrators should enforce automatic update policies for all browser installations across their infrastructure to prevent exposure to known vulnerabilities. Users can also employ additional layers of defense such as enabling site isolation features in Chrome, which further restricts how different origins interact with each other and the underlying system memory. Regular monitoring of vulnerability databases and timely application of patches are essential practices to maintain a robust security posture against evolving web-based threats.
This incident aligns with Common Weakness Enumeration (CWE) category CWE-843, which refers to Access of Incorrect Type or Misinterpreted as Another Type. It also relates to the ATT&CK technique T1059, Command and Scripting Interpreter, if exploited for initial access or execution phases in an attack chain. Understanding these classifications helps security teams categorize similar incidents and apply appropriate detection rules within their Security Information and Event Management (SIEM) systems. By addressing type confusion vulnerabilities promptly, organizations reduce the attack surface available to adversaries seeking to compromise browser-based environments through sophisticated web exploitation techniques.