CVE-2026-100812 in Firefox
Summary
by MITRE • 09/29/2026
Denial-of-service in the Graphics 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 of Mozilla Firefox, specifically targeting components responsible for rendering visual content on user displays. Denial-of-service vulnerabilities in graphical processing units or their software drivers often stem from improper handling of malformed input data that triggers unexpected states during image decoding, texture mapping, or shader execution. In this specific instance, the flaw likely involves a scenario where specially crafted graphics commands or corrupted media files cause the browser's rendering engine to enter an unstable state. This instability typically manifests as excessive resource consumption, such as memory leaks or CPU spikes, which can lead to application hangs, crashes, or system-wide unresponsiveness if the affected process is critical to the operating environment.
From a technical perspective, this issue aligns with CWE-400, Uncontrolled Resource Consumption, where an attacker can cause the target system to consume excessive resources without proper limits or checks in place. The vulnerability exploits weaknesses in how Firefox processes graphical data structures, potentially failing to validate input boundaries or handle error conditions gracefully during the rendering pipeline. When a malicious actor supplies crafted content designed to trigger this flaw, they can force the graphics component into an infinite loop or allocate unbounded memory, effectively denying service to legitimate users who rely on the browser for web access and productivity tasks.
The operational impact of such a vulnerability is significant in environments where Firefox serves as the primary internet client. A successful exploitation could result in the complete freeze of the browser window, requiring manual termination via task managers or system restarts. In more severe cases involving kernel-level graphics drivers triggered through the browser sandbox escape mechanisms, it might lead to broader system instability affecting other applications running on the same machine. This poses a risk not only to individual users but also to organizations deploying Firefox in enterprise settings where consistent availability of web-based tools is critical for business continuity.
Mitigation strategies primarily involve applying the vendor-provided patches released in Firefox ESR 153.4 and Firefox 157, which address the underlying logic errors within the graphics processing routines. Administrators should ensure that all endpoints are updated to these versions or later to eliminate the attack surface associated with this specific flaw. Additionally, implementing network-level filtering to block access to known malicious domains hosting exploit kits can provide an additional layer of defense against automated attacks targeting unpatched systems. Regular security audits and monitoring for anomalous resource usage patterns in browser processes can also help detect potential exploitation attempts before they result in full denial-of-service conditions.