CVE-2026-92007 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 stems from a logic error in how the browser handles memory boundaries or array indices during WebGL rendering operations. When an attacker crafts a malicious webpage containing specially designed JavaScript and WebGL shaders, they can exploit these miscalculated bounds to write data outside of intended memory regions. In modern web browsers, the renderer process operates with restricted privileges compared to the main browser process. However, by leveraging this boundary condition error, it is possible to achieve arbitrary code execution within a higher-privileged context or escape the sandbox entirely. This type of vulnerability is critical because it allows an attacker to bypass security controls that are designed to isolate web content from the underlying operating system and user data.
From a technical perspective, this issue aligns with CWE-190, which describes integer overflow or wraparound errors, as well as CWE-787, which pertains to out-of-bounds write vulnerabilities. The root cause typically involves insufficient validation of input values before they are used in memory allocation or array indexing operations within the graphics processing pipeline. When these checks fail, the application may access memory locations that it should not have permission to touch. This can lead to heap corruption, which is a common precursor to successful exploitation attempts where an attacker gains control over program execution flow. The complexity of WebGL shaders and their interaction with browser rendering engines makes such boundary errors particularly difficult to detect through standard code review processes without specialized fuzzing techniques or formal verification methods.
The operational impact of this vulnerability is severe due to its potential for privilege escalation. An attacker who successfully exploits this flaw can execute arbitrary commands on the victim's system, potentially leading to full compromise of the user account. This could result in unauthorized access to sensitive files, installation of persistent malware, or use of the compromised machine as part of a botnet. Since WebGL is widely used for rendering 3D graphics and complex visualizations on the web, many legitimate websites utilize this technology, increasing the attack surface. Users visiting maliciously crafted sites that exploit this flaw may find their systems taken over without any further interaction required beyond loading the page. This underscores the importance of timely patching to mitigate risks associated with remote code execution via browser-based attacks.
To address this issue, users must ensure they are running a patched version of Firefox or its extended support releases. The vulnerability was resolved in Firefox 156, as well as in specific maintenance updates for Extended Support Release versions including ESR 115.41, ESR 140.16, and ESR 153.3. Organizations relying on these browsers should prioritize deploying these updates across all endpoints to close the security gap. Additionally, implementing browser hardening techniques such as disabling unnecessary plugins or restricting WebGL access for untrusted sites can provide an additional layer of defense. Security teams should also monitor for indicators of compromise related to abnormal memory usage patterns in renderer processes, which may signal active exploitation attempts against this vulnerability before patches are fully deployed across all systems.