CVE-2026-92072 in Firefox
Summary
by MITRE • 09/15/2026
Incorrect boundary conditions in the Safe Browsing component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.
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Analysis
by VulDB Data Team • 09/15/2026
The identified security issue resides within the Safe Browsing subsystem of Mozilla Firefox, specifically involving incorrect boundary condition handling during data processing operations. Safe Browsing is a critical defense mechanism designed to protect users from visiting malicious websites that may host malware, phishing attempts, or other harmful content. The vulnerability arises when the component fails to properly validate input boundaries, potentially allowing for out-of-bounds memory access or logic errors that deviate from expected operational parameters. Such boundary condition flaws often stem from insufficient checks on array indices, buffer sizes, or data length constraints before processing external inputs derived from network responses or local cache entries.
From a technical perspective, incorrect boundary conditions can lead to severe consequences including heap corruption, information disclosure, or arbitrary code execution if the flaw is exploitable in conjunction with other factors. In the context of browser security, these vulnerabilities are particularly dangerous because they occur within high-privilege processes that handle sensitive user data and network traffic. An attacker could potentially craft a malicious webpage or manipulate Safe Browsing database updates to trigger this boundary error, leading to memory corruption that might be leveraged for further exploitation steps such as sandbox escape. The presence of such flaws undermines the integrity of the browsing session and compromises the confidentiality and availability of user information.
This vulnerability is categorized under CWE-193: Off-by-One Error or similar categories related to improper limit validation, which are common sources of memory safety issues in C and C++ based software like Firefox. In terms of attack vectors, it aligns with MITRE ATT&CK techniques involving client-side exploitation, specifically those that target browser vulnerabilities for initial access or privilege escalation within the local environment. The flaw highlights the complexity of maintaining secure boundary checks across large codebases where multiple components interact with shared data structures and network inputs.
To mitigate this risk, users are strongly advised to update their Firefox installation immediately to version 156 or later, including the Extended Support Release (ESR) version 153.3 which also contains the necessary patches. These updates include code changes that enforce stricter validation of input boundaries within the Safe Browsing module, ensuring that all data processing operations remain within allocated memory limits and logical constraints. Organizations relying on Firefox for enterprise environments should prioritize deploying these updates across all endpoints to maintain a robust security posture against potential browser-based attacks. Regular patch management is essential as new vulnerabilities are discovered and addressed in subsequent releases of web browsers.