CVE-2026-103628 in Chrome
Summary
by MITRE • 10/02/2026
Out of bounds write in WebGL in Google Chrome prior to 154.0.8037.97 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 • 10/02/2026
The vulnerability identified as an out-of-bounds write within the WebGL implementation of Google Chrome prior to version 154.0.8037.97 represents a critical memory corruption flaw that undermines the browser's sandboxing mechanisms. This type of error typically arises when software performs a write operation to a memory location beyond the boundaries of an allocated buffer, often due to insufficient validation of array indices or pointer arithmetic during graphics processing tasks. In the context of WebGL, which allows web pages to access OpenGL ES 2.0-like commands for rendering interactive 3D and 2D graphics without plug-ins, such flaws are particularly dangerous because they occur within high-privilege processes responsible for hardware acceleration and memory management. The Chromium security team has classified this issue with a Critical severity rating, indicating that it poses an immediate and severe risk to user systems when exploited through malicious web content.
From a technical perspective, the root cause lies in the handling of WebGL API calls where input parameters are not rigorously checked against valid memory ranges before being passed to lower-level graphics drivers or internal rendering pipelines. When a crafted HTML page containing specific JavaScript code triggers these malformed operations, it can force the browser to write data into adjacent memory regions that may contain executable code structures, function pointers, or other critical control flow data. This arbitrary write capability allows an attacker to manipulate the program's execution path, potentially leading to remote code execution with the privileges of the current user process. The exploitation vector is entirely web-based, meaning a victim only needs to visit a maliciously constructed webpage for the attack to be initiated, leveraging social engineering or drive-by download tactics common in modern cyber threats.
The operational impact of this vulnerability extends beyond simple data leakage; it facilitates full system compromise by bypassing Chrome's sandbox isolation. Modern browsers employ multi-process architectures and sandboxes to limit the damage a compromised web page can cause, but an out-of-bounds write that escapes these boundaries effectively neutralizes these protections. An attacker could install malware, steal sensitive credentials, or use the infected machine as part of a botnet. This aligns with the MITRE ATT&CK framework technique T1203, which covers Exploitation for Client Execution, where attackers leverage vulnerabilities in client software to gain initial access and execute arbitrary code on the target system. Furthermore, this flaw corresponds closely to CWE-787, an out-of-bounds write vulnerability, which is consistently ranked among the most dangerous memory safety errors due to its potential for control flow hijacking.
Mitigation strategies primarily involve immediate patching of the affected browser version to 154.0.8037.97 or later, where these boundary checks have been reinforced and input validation logic has been corrected. For organizations managing large fleets of devices, automated deployment tools should be utilized to ensure rapid distribution of this update across all endpoints. In environments where immediate patching is not feasible, network-level controls such as web filtering proxies can help block access to known malicious domains hosting exploit kits that target this specific vulnerability. Additionally, enabling Chrome's built-in sandbox features and keeping operating system security patches up to date provides layered defense mechanisms that may mitigate the success rate of exploitation attempts by restricting the privileges available even if a memory corruption occurs.