CVE-2026-16350 in Firefox
Summary
by MITRE • 07/21/2026
Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability identified in the Audio/Video cubeb component represents a critical boundary condition flaw that could potentially allow attackers to execute arbitrary code or cause denial of service conditions within affected Firefox installations. This type of vulnerability falls under the broader category of memory safety issues that have historically been among the most exploited classes of flaws in browser components. The cubeb audio subsystem serves as a cross-platform audio I/O library that handles audio processing and playback operations, making it a prime target for attackers seeking to compromise user systems through media-related attacks.
The technical nature of this boundary condition error suggests that the cubeb component fails to properly validate input parameters or buffer boundaries when processing audio/video data streams. Such flaws typically occur when developers do not adequately check array indices, buffer sizes, or other boundary values during audio processing operations. When these conditions are improperly handled, they can lead to memory corruption scenarios where attackers might be able to manipulate program execution flow through crafted media content or malicious websites. This vulnerability directly relates to common weakness enumerations such as CWE-129, which addresses insufficient validation of length of input buffers, and CWE-787, which covers out-of-bounds write operations.
From an operational impact perspective, this vulnerability poses significant risks to Firefox users who may encounter compromised systems through routine web browsing activities. Attackers could exploit this flaw by delivering malicious audio or video content that triggers the boundary condition error when processed by the cubeb component. The exploit potential is particularly concerning given that modern browsers frequently process multimedia content from untrusted sources, and the cubeb library's role in handling audio I/O operations makes it a frequent target for such attacks. This aligns with ATT&CK technique T1059.007 which covers command and scripting interpreter usage through browser-based attacks.
The remediation efforts included in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13 demonstrate the severity of this issue as it required immediate attention across multiple release channels. These updates likely implemented proper boundary checks, input validation mechanisms, and memory safety improvements within the cubeb component to prevent out-of-bounds access conditions. Organizations should prioritize deployment of these security patches, particularly given that many users continue to operate older versions of Firefox ESR releases that may still be vulnerable to this class of attack. The vulnerability's resolution reflects industry best practices for addressing memory safety issues in multimedia libraries through comprehensive code review and testing procedures.
The broader implications of this vulnerability extend beyond the immediate technical fix, as it highlights the ongoing challenges in securing multimedia processing components within web browsers. Audio and video processing libraries often handle complex data structures and real-time operations that create numerous potential attack surfaces for boundary condition exploits. This vulnerability serves as a reminder of the importance of maintaining up-to-date browser installations and implementing layered security approaches that include regular patch management, network monitoring, and user awareness training to protect against sophisticated attacks targeting multimedia processing components.