CVE-2026-16393 in Firefox
Summary
by MITRE • 07/21/2026
Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability described represents a critical boundary condition error within the WebGPU graphics component of the Firefox browser, specifically affecting the graphics processing capabilities that enable web applications to access advanced GPU functionalities through the WebGPU API. This type of flaw typically arises when the software fails to properly validate input parameters or memory boundaries during graphics operations, potentially allowing malicious actors to exploit these gaps in validation logic. The vulnerability exists within the graphics subsystem that handles WebGL and WebGPU implementations, which are essential for modern web applications requiring high-performance graphics rendering capabilities.
The technical nature of this boundary condition flaw suggests that it likely involves inadequate bounds checking during memory allocation or buffer operations within the WebGPU implementation. When processing graphics commands or data structures from web applications, the graphics driver components may not properly validate array indices, buffer sizes, or memory access patterns, creating potential opportunities for memory corruption or arbitrary code execution. This type of vulnerability falls under the broader category of memory safety issues that are commonly classified as CWE-129 Input Validation and Output Conversion and may also relate to CWE-787 Out-of-bounds Write, depending on the specific implementation details. The flaw essentially allows attackers to manipulate graphics processing operations beyond their intended boundaries, potentially leading to system compromise.
The operational impact of this vulnerability extends significantly within the browser environment where WebGPU is utilized, as it could enable remote code execution when a user visits a malicious website or interacts with compromised web content. Attackers could exploit this weakness by crafting specially designed graphics operations that trigger the boundary condition error, potentially leading to privilege escalation or complete system compromise depending on the execution context and underlying operating system protections. This vulnerability directly impacts the security model of modern browsers where web applications are sandboxed but still require access to powerful graphics processing capabilities through APIs like WebGPU. The attack surface is particularly concerning given that WebGPU is designed for high-performance graphics and compute operations, making it an attractive target for exploitation.
Mitigation strategies for this vulnerability should focus on immediate patching of the Firefox browser to version 153 or later where the fix has been implemented, as well as implementing additional security measures such as enabling sandboxing features and monitoring for anomalous graphics processing behaviors. Organizations should also consider applying web application firewalls that can detect and block suspicious graphics-related requests, though these protections may be limited given that this is a browser-level vulnerability. The fix likely involves implementing proper boundary checks within the graphics processing pipeline, ensuring that all buffer operations are validated against their allocated memory regions before execution. Security teams should monitor for any exploitation attempts targeting this specific vulnerability through threat intelligence feeds and network monitoring systems, as the ATT&CK framework would categorize this under techniques such as T1059 Command and Scripting Interpreter or T1203 Exploitation for Client Execution when leveraging browser vulnerabilities for remote code execution.