CVE-2026-92063 in Firefox
Summary
by MITRE • 09/15/2026
Denial-of-service in the Audio/Video component. This vulnerability was fixed in Firefox 156.
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Analysis
by VulDB Data Team • 09/15/2026
The identified security issue represents a denial of service condition within the audio and video processing subsystems of Mozilla Firefox, specifically affecting versions prior to release 156. Denial of service vulnerabilities generally arise when an application fails to properly handle unexpected or malformed input data, leading to resource exhaustion, infinite loops, or crashes that render the software unusable for legitimate users. In the context of web browsers, such flaws are particularly critical because they can be triggered remotely by malicious websites without requiring user interaction beyond visiting a crafted page or playing embedded media content. The audio and video components involve complex decoding pipelines that process large amounts of data in real time, making them susceptible to edge cases where memory management errors or logic flaws occur during the parsing or rendering of multimedia streams.
From a technical perspective, this vulnerability likely stems from improper validation of input parameters within the media decoder or renderer modules. When processing specially crafted audio or video files, the application may encounter an unhandled exception, buffer overflow, or state corruption that causes the process to terminate unexpectedly or consume excessive system resources such as CPU cycles and memory. This behavior aligns with common vulnerability classifications found in industry standards, particularly CWE-400 which denotes unconstrained resource consumption, a frequent cause of denial of service attacks. The flaw indicates a gap in the robustness checks implemented within the multimedia handling logic, where the software assumes valid input formats or fails to enforce strict boundaries on data sizes and processing times.
The operational impact of this vulnerability is primarily centered around availability rather than confidentiality or integrity. An attacker could exploit this weakness by hosting malicious web content that triggers the denial of service condition when accessed by a victim using an affected version of Firefox. This would result in the browser crashing, freezing, or becoming unresponsive, effectively preventing the user from accessing other tabs or applications running within the same process group depending on the architecture implementation. While modern browsers often employ sandboxing to limit the blast radius of such exploits, a crash still disrupts productivity and can be used as part of a broader attack chain where stability is required for subsequent exploitation steps. The lack of persistence means that once the browser is restarted, normal operation resumes, but repeated attacks could lead to significant user frustration or serve as a distraction technique in more complex social engineering scenarios.
Mitigation strategies focus on both immediate remediation and long-term defensive measures. The primary solution is to upgrade Mozilla Firefox to version 156 or later, where the developers have implemented patches that address the underlying logic errors responsible for the crash. Users should ensure automatic updates are enabled to receive security fixes promptly as they become available. Additionally, organizations can enforce browser update policies through endpoint management solutions to maintain a consistent and secure baseline across all workstations. From an architectural standpoint, continuing to rely on sandboxing mechanisms helps isolate media processing tasks from critical system resources, reducing the impact of any future vulnerabilities in this component. Security teams should also monitor for emerging threats related to multimedia parsing libraries used by Firefox, such as GStreamer or FFmpeg integrations, and apply vendor-provided patches promptly when new CVEs are disclosed affecting these underlying dependencies.