CVE-2026-92051 in Firefox
Summary
by MITRE • 09/15/2026
Spoofing issue due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 156.
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Analysis
by VulDB Data Team • 09/15/2026
The identified security flaw resides within the graphics subsystem of Mozilla Firefox, specifically involving an invalid memory pointer that leads to a spoofing vulnerability. In complex software architectures like web browsers, the graphics engine is responsible for rendering visual content by translating high-level drawing commands into low-level instructions for the GPU or CPU. When this component fails to properly validate pointers before dereferencing them, it creates a condition where the application may access memory locations that are either uninitialized, freed, or otherwise invalid. This type of error typically falls under the category of CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer or more specifically CWE-476 NULL Pointer Dereference if the pointer is null, or CWE-825 Expired Reference to Memory Resource if it points to freed memory. The core technical issue is that the application does not adequately check whether the pointer being used for graphics operations is valid and within expected bounds before executing the associated rendering logic.
The operational impact of this vulnerability centers on the potential for spoofing attacks, which can undermine user trust and security expectations. Spoofing in this context implies an attacker could manipulate visual output to deceive users or system processes. For instance, by exploiting the invalid pointer, a malicious web page might be able to alter how certain UI elements are rendered, potentially making them appear as if they originate from a trusted source when they do not. This can facilitate phishing attacks where fake login prompts or security warnings are visually mimicked with high fidelity because the browser's rendering pipeline is compromised. Furthermore, depending on the specific memory corruption details, such an invalid pointer could lead to arbitrary code execution if the attacker can control the data written to or read from that memory location, although the primary classification here emphasizes spoofing rather than direct remote code execution. This highlights a critical intersection between memory safety and user interface integrity, where technical flaws in rendering directly translate into social engineering opportunities for adversaries.
From an industry standards perspective, this vulnerability aligns with ATT&CK technique T1078 Valid Accounts or related impersonation tactics if the spoofing allows bypass of authentication visuals, but more accurately it relates to defense evasion and persistence mechanisms that rely on visual deception. The flaw represents a failure in input validation at the system level, where external data from web content influences internal state without sufficient sanitization. Security researchers often categorize such issues under memory corruption vulnerabilities because they stem from unsafe handling of pointers within native code components like C++ graphics engines. The presence of an invalid pointer suggests that the application's error handling paths were not robust enough to catch and safely terminate operations involving bad references, allowing the execution flow to continue into undefined behavior territory.
Mitigation for this specific issue was implemented in Firefox version 156 through rigorous code review and patching of the graphics component logic. The fix likely involved adding explicit null checks or bounds validation before any pointer dereference occurs within the rendering pipeline. Developers must ensure that all pointers derived from external inputs, such as web content coordinates or style properties, are validated against expected ranges and memory states prior to use. For users, upgrading to Firefox 156 is essential to eliminate this risk. Organizations should enforce automated update policies for browser deployments to ensure that patches addressing critical rendering vulnerabilities are applied promptly. Additionally, employing sandboxing techniques can limit the impact of such flaws by restricting what a compromised graphics process can access in terms of system resources and user data, thereby reducing the potential damage even if an exploit attempt occurs. Continuous monitoring for similar patterns in other components is also recommended to maintain overall application integrity against memory-related threats.