CVE-2026-92006 in Firefox
Summary
by MITRE • 09/15/2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
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Analysis
by VulDB Data Team • 09/15/2026
The identified security flaw resides within the CanvasWebGL component of Mozilla Firefox, specifically involving incorrect boundary conditions that facilitate privilege escalation. This vulnerability highlights a critical failure in input validation or memory management logic during the processing of WebGL contexts. In modern web browsers, the rendering engine operates with elevated privileges to ensure high-performance graphics acceleration and complex visual computations. When an attacker can manipulate these boundary conditions, they may bypass intended security restrictions, allowing code executed within the browser sandbox to access resources or perform actions that should be restricted to higher-privilege system levels. The core technical issue stems from a lack of rigorous checks on array indices, buffer sizes, or memory offsets during WebGL operations, which can lead to out-of-bounds reads or writes if exploited effectively by malicious web content.
From an operational perspective, this vulnerability poses a significant risk because it undermines the browser's sandboxing model. The primary defense mechanism against remote code execution and data theft is the isolation of untrusted web pages from sensitive system resources. By exploiting incorrect boundary conditions in CanvasWebGL, a threat actor could potentially escape this sandbox environment. This escalation allows for arbitrary memory access or modification, which can be leveraged to execute malicious payloads with higher privileges than those granted to standard browser processes. Such an exploit would enable attackers to compromise user data, install persistent malware, or pivot further into internal networks if the compromised machine is part of a larger infrastructure. The impact is particularly severe given that WebGL is widely used for rendering 3D graphics in web applications, making it a common target for drive-by attacks and malicious script injection.
This type of vulnerability aligns with CWE-125, Out-of-bounds Read, or potentially CWE-787, Out-of-bounds Write, depending on the specific nature of the boundary condition failure. These weaknesses are fundamental flaws in software design where memory access checks are insufficient or incorrectly implemented. In terms of offensive security frameworks, this exploit path corresponds to MITRE ATT&CK techniques related to Defense Evasion and Privilege Escalation, specifically leveraging browser vulnerabilities to bypass sandbox restrictions. Attackers often utilize such flaws as part of a multi-stage attack chain, starting with initial access via malicious web content and progressing toward system compromise through privilege escalation. The existence of this flaw underscores the complexity of maintaining secure boundaries in highly optimized graphics rendering engines that must balance performance with strict security constraints.
Mitigation for this vulnerability relies primarily on applying the software updates released by Mozilla. Users should ensure they are running Firefox version 156 or later, as well as the specific Extended Support Release (ESR) versions: ESR 115.41, ESR 140.16, and ESR 153.3. These updates contain patches that correct the boundary condition checks within the CanvasWebGL component, thereby preventing unauthorized memory access or privilege escalation attempts. For organizations managing large fleets of browsers, automated patch management systems should be configured to prioritize these specific version numbers to ensure consistent protection across all endpoints. Additionally, security teams can implement browser hardening policies such as disabling WebGL in environments where it is not strictly necessary, although this may impact functionality for legitimate web applications. Continuous monitoring and keeping software up-to-date remain the most effective strategies against exploits targeting rendering engine vulnerabilities like this one.