CVE-2026-95329 in Chrome
Summary
by MITRE • 09/29/2026
Out of bounds write in WebGL in Google Chrome on on Android prior to 154.0.8037.57 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability described constitutes an out-of-bounds write flaw within the WebGL implementation of Google Chrome on Android, specifically affecting versions prior to 154.0.8037.57. This type of memory corruption error arises when a program writes data beyond the boundaries of allocated memory buffers, often due to insufficient validation of array indices or buffer sizes during graphics rendering operations. In the context of WebGL, which provides an API for interactive 2D and 3D graphics within web browsers without plug-ins, such flaws are particularly dangerous because they occur in high-privilege contexts where GPU commands are processed. The Chromium security team has classified this issue with a Critical severity rating, indicating that it poses a significant risk to the stability and security of the browser environment.
From a technical perspective, an out-of-bounds write allows for arbitrary memory modification if the attacker can control the offset or size parameters passed to the WebGL functions. By crafting a malicious HTML page that triggers specific shader compilations or buffer updates with malformed data, a remote attacker can overwrite adjacent memory structures. This may include overwriting function pointers, return addresses, or other critical metadata used by the browser's sandboxing mechanisms. The exploitation of this flaw does not require user interaction beyond visiting the crafted webpage, making it suitable for drive-by download attacks where no further steps are needed to trigger the vulnerability.
The operational impact of successfully exploiting this vulnerability is severe, as it can lead to arbitrary code execution outside the confines of the browser sandbox. Modern browsers rely on a multi-process architecture and strict sandboxes to limit the damage caused by compromised web content. However, an out-of-bounds write in WebGL can bypass these protections by corrupting memory structures that enforce isolation between processes or by hijacking control flow within the renderer process itself. Once arbitrary code execution is achieved, the attacker gains full control over the affected system, potentially leading to data theft, installation of malware, or further lateral movement within a network if the browser was used in an enterprise environment with sensitive credentials cached locally.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-787: Out-of-bounds Write, which describes writing to a memory location that is outside the bounds of the intended buffer. In terms of attack tactics, this scenario maps closely to MITRE ATT&CK technique T1203: Exploitation for Client Execution, where attackers leverage vulnerabilities in client software like web browsers to execute malicious code on the victim's device. The use of a crafted HTML page also reflects common practices seen in techniques such as T1189: Drive-by Compromise, relying on social engineering or compromised legitimate websites to deliver the exploit payload.
Mitigation for this vulnerability primarily involves updating Google Chrome and its underlying Chromium engine to version 154.0.8037.57 or later, where the memory safety checks have been strengthened to prevent out-of-bounds writes during WebGL operations. Administrators should ensure that automatic updates are enabled to maintain protection against such critical flaws as they are discovered. Additionally, users can reduce their exposure by disabling JavaScript on untrusted sites or using browser extensions that restrict access to potentially dangerous APIs, although these measures may impact usability and do not replace the need for patching. Security teams should also monitor for indicators of compromise related to WebGL exploitation attempts in network logs and endpoint detection systems to identify potential active attacks targeting older versions of the software.