CVE-2026-87438 in Chrome
Summary
by MITRE • 09/09/2026
Out of bounds write in WebGL in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds write within the WebGL subsystem of Google Chrome on Android represents a critical memory corruption flaw that undermines the browser's core security model. This issue stems from improper boundary checks during the processing of graphics commands, specifically when handling shader programs or texture operations via JavaScript interfaces exposed to web pages. When a malicious actor constructs an HTML page containing specially crafted WebGL calls, they can trigger a condition where data is written beyond the allocated memory buffer boundaries. Because this operation occurs within the renderer process which operates under strict sandboxing restrictions designed to isolate untrusted content from the host operating system and user files, the successful exploitation of this flaw allows for arbitrary code execution outside these protective confines. The severity rating of Critical by Chromium security reflects the high likelihood of exploitability given the ubiquity of WebGL in modern web applications and the direct path it provides to bypassing sandbox isolation mechanisms.
From a technical perspective, out-of-bounds writes are particularly dangerous because they can corrupt adjacent memory structures such as function pointers, object headers, or heap metadata. In the context of Chrome's V8 JavaScript engine and GPU process communication, manipulating these memory regions enables an attacker to achieve arbitrary read-write primitives. This capability is essential for constructing reliable exploits that lead to remote code execution. The attack vector relies on social engineering or drive-by download tactics where a victim visits a compromised website hosting the malicious HTML payload. Once executed within the browser environment, the crafted WebGL commands interact with the underlying graphics driver and software rasterizer components, exploiting logic errors in how array bounds are validated before memory allocation or data transfer operations occur.
The operational impact of this vulnerability is severe, as it effectively neutralizes the sandboxing protections that Chrome employs to contain potential threats from web content. Successful exploitation allows a remote attacker to execute arbitrary code with the privileges of the browser process on the Android device. This can lead to full system compromise depending on the specific version and configuration of the operating system, potentially allowing access to sensitive user data, installation of persistent malware, or use of the device as part of a botnet. The ability to escape the sandbox is particularly concerning because it transforms what would otherwise be an isolated rendering error into a critical security breach affecting the entire host environment.
Mitigation strategies primarily involve applying the latest available updates for Google Chrome on Android, which include patches that enforce stricter bounds checking and improve validation logic within the WebGL implementation. Organizations should ensure rapid deployment of these updates across all mobile endpoints to minimize exposure windows. Additionally, users can reduce risk by disabling JavaScript in untrusted sites or using browser extensions that restrict access to powerful APIs like WebGL when not explicitly required for specific trusted applications. Monitoring network traffic for unusual connections from browser processes may also help detect exploitation attempts post-vulnerability disclosure. Industry standards such as CWE-787 Out-of-bounds Write and ATT&CK technique T1203 Exploitation for Client Execution provide frameworks for understanding the nature of this flaw and aligning defensive measures with established security best practices to prevent similar memory corruption vulnerabilities in future software releases.