CVE-2026-100806 in Firefox
Summary
by MITRE • 09/29/2026
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
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Analysis
by VulDB Data Team • 09/29/2026
The identified vulnerability resides within the Graphics subsystem, specifically affecting the WebGPU implementation in Mozilla Firefox browsers. Uninitialized memory errors represent a class of defects where software attempts to read from a memory location that has not been properly initialized with valid data prior to access. In the context of GPU-accelerated web technologies like WebGPU, such flaws can arise during complex rendering pipelines or shader execution contexts where buffer allocations and state transitions occur rapidly. When an uninitialized value is utilized in these operations, it may lead to unpredictable behavior ranging from visual artifacts on the display to more severe security implications depending on how that memory content interacts with subsequent processing logic.
From a technical perspective, this flaw aligns closely with CWE-457, which describes the use of an uninitialized variable. The presence of such data in GPU command buffers or shader inputs can potentially allow for information disclosure if sensitive kernel-mode data is inadvertently exposed to user-space processes through malformed rendering commands. Furthermore, depending on the specific memory layout and how the browser handles these graphical operations, there may be risks associated with CWE-125, Out-of-bounds Read, if the uninitialized pointer or value leads the renderer to access memory regions outside of intended boundaries. These types of vulnerabilities are particularly concerning in modern web browsers because they can potentially be exploited via maliciously crafted WebGL or WebGPU content hosted on a compromised website, leading to cross-site scripting-like effects or sandbox escapes under certain conditions.
The operational impact of this vulnerability is significant for users relying on Firefox ESR and standard releases for secure browsing experiences involving hardware-accelerated graphics. An attacker could potentially craft a specially designed web page that triggers the uninitialized memory access during WebGPU initialization or rendering phases. While immediate exploitation might require specific environmental conditions, such vulnerabilities often serve as building blocks for more complex attack chains aimed at bypassing browser security mitigations like ASLR and DEP. The lack of proper initialization means that the behavior is non-deterministic, making it difficult to predict exactly how an exploit would manifest but increasing the likelihood of crashes or data leakage across different hardware configurations and driver versions.
To mitigate this risk, users must ensure their browsers are updated to Firefox ESR 153.4 or Firefox version 157 and later, as these releases contain the necessary patches to properly initialize memory buffers before they are used in WebGPU operations. Security teams should also consider implementing strict Content Security Policies that restrict the use of experimental web technologies like WebGPU until all components are verified secure. Additionally, monitoring for unusual browser crashes or performance anomalies related to graphics-intensive websites can help identify potential exploitation attempts in real-time. Regular security audits and static analysis tools focused on memory safety issues within C++ codebases used by browser engines are essential preventive measures against such low-level defects.