CVE-2026-92010 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 graphics rendering engine handles memory boundaries during WebGL operations. When processing complex graphical commands or shader executions, the software fails to properly validate input parameters against allocated buffer limits. This oversight allows an attacker who can trigger specific WebGL contexts within a web page to write data outside of intended memory regions. The core technical issue is rooted in improper boundary checking mechanisms that do not adequately sanitize user-supplied coordinates or array indices before they are passed to lower-level graphics APIs, leading to out-of-bounds writes.
From a threat modeling perspective, this vulnerability aligns with CWE-125, which describes Out-of-Bounds Read, and potentially CWE-787, an Out-of-Bounds Write depending on the specific exploitation vector utilized by malicious actors. The ability to write beyond allocated memory boundaries is particularly dangerous as it can lead to arbitrary code execution if the attacker can control the data written or target critical structures within the browser process. In the context of modern web browsers, such flaws are often leveraged in conjunction with other vulnerabilities to escape sandbox restrictions. This aligns with MITRE ATT&CK technique T1059, Command and Scripting Interpreter, as well as techniques related to privilege escalation where a lower-privileged process gains higher-level access by exploiting kernel or system component bugs.
The operational impact of this vulnerability is severe for users browsing untrusted websites that contain malicious WebGL content. An attacker could craft a webpage with specially designed JavaScript code that exploits the boundary condition error in CanvasWebGL. Upon execution, this code could allow the attacker to execute arbitrary commands on the victim's machine by escalating privileges from the restricted browser sandbox to the user level or even system level, depending on the specific environment and configuration of Firefox. This compromises the integrity and confidentiality of the user's data, potentially leading to full system compromise if combined with other exploits. The risk is heightened because WebGL is widely used for legitimate web applications including games, 3D modeling tools, and visualizations, making it a common target for drive-by attacks.
To mitigate this vulnerability, users must ensure that their Firefox installation is updated to version 156 or later, which includes the necessary patches for ESR branches 115.41, 140.16, and 153.3. These updates contain code changes that enforce stricter boundary checks within the CanvasWebGL implementation, preventing out-of-bounds memory access during rendering operations. Organizations should implement automated patch management systems to deploy these security fixes promptly across all endpoints running Firefox. Additionally, users can reduce exposure by disabling WebGL in high-risk environments or using browser extensions that restrict JavaScript execution on untrusted sites. Regular security audits and penetration testing of web applications utilizing heavy graphics processing can also help identify similar implementation flaws before they are exploited in the wild.