CVE-2026-87586 in Chrome
Summary
by MITRE • 09/09/2026
Out of bounds read in ANGLE in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to read memory outside 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 identified as an out-of-bounds read within the ANGLE graphics library in Google Chrome prior to version 153.0.8010.36 represents a significant memory safety flaw that undermines the browser's sandboxing mechanisms. ANGLE serves as a critical translation layer between web applications and underlying hardware graphics APIs, converting OpenGL ES calls into DirectX or Vulkan commands depending on the host system. When processing crafted HTML pages containing malicious JavaScript or WebGL content, this component failed to properly validate array indices or buffer boundaries before accessing memory locations. This lack of rigorous bounds checking allowed the application to read data from adjacent memory regions that were not intended for access by the web page context.
From a technical perspective, this flaw is classified under CWE-125, which denotes an out-of-bounds read vulnerability. The root cause lies in insufficient validation logic within the graphics processing pipeline of ANGLE. When a remote attacker constructs a specific HTML payload designed to trigger anomalous rendering operations or shader executions, they can manipulate memory pointers such that the application retrieves data from outside the allocated buffer space. Because this operation occurs during the execution of web content, it bypasses standard JavaScript security restrictions and interacts directly with lower-level system resources managed by the browser engine.
The operational impact of this vulnerability is severe due to its potential for sandbox escape. While an out-of-bounds read typically results in information disclosure rather than arbitrary code execution, the ability to leak memory contents from outside the Chrome sandbox allows attackers to gather sensitive data such as cookies, session tokens, or cryptographic keys stored in other browser processes. Furthermore, leaked memory addresses can facilitate further exploitation by revealing layout information necessary for constructing more complex attacks like heap spraying or return-oriented programming sequences. This aligns with MITRE ATT&CK technique T1005, which covers Data from Local System, and specifically relates to the initial access and privilege escalation phases where an attacker leverages a browser vulnerability to gain unauthorized access to protected memory spaces.
Mitigation strategies primarily involve updating Google Chrome to version 153.0.8010.36 or later, as this release includes patches that enforce stricter bounds checking within the ANGLE library. Developers integrating WebGL or similar graphics technologies should ensure their environments are updated with the latest stable browser versions and libraries. Additionally, implementing Content Security Policy headers can help mitigate some risks by restricting the sources from which scripts and resources are loaded, although it does not directly prevent exploitation of this specific memory corruption flaw. Regular security audits focusing on C++ code paths involving array indexing and pointer arithmetic in graphics processing components are recommended to detect similar issues early in the development lifecycle.