CVE-2026-106401 in Chrome
Summary
by MITRE • 10/07/2026
Out of bounds write in Media in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an out-of-bounds write within the Media component of Google Chrome prior to version 155.0.8059.39 represents a critical memory corruption flaw that undermines the browser's core security architecture. This specific type of error occurs when a program writes data beyond the boundaries of allocated memory buffers, often due to insufficient validation of input lengths or index calculations during media processing operations. In the context of web browsers, such flaws are particularly dangerous because they can allow an attacker to corrupt adjacent memory structures, potentially leading to arbitrary code execution if the corrupted memory is later used for control flow decisions or data retrieval. The severity rating of Medium by Chromium reflects the complexity required to exploit this flaw reliably in a fully patched environment with modern mitigations enabled, yet it remains significant due to its potential impact on system integrity.
From a technical perspective, the Media component handles various multimedia formats and codecs embedded within web pages. When processing crafted HTML content containing maliciously constructed media files or scripts that trigger specific decoding paths, the application fails to properly verify memory access boundaries. This oversight allows an attacker who hosts a specially designed webpage to induce a write operation into unauthorized memory regions. The exploitation of this vulnerability typically involves crafting a payload that triggers the out-of-bounds condition in a controlled manner, aiming to overwrite critical data structures such as function pointers or object headers. Successful exploitation could enable the execution of arbitrary code within the context of the browser process, although modern sandboxing mechanisms are designed to restrict the impact of such breaches by isolating renderer processes from sensitive system resources and user data.
The operational impact of this vulnerability is substantial for users who visit maliciously crafted websites or click on links containing embedded media content that triggers the flaw. While the Chrome sandbox provides a robust defense-in-depth strategy, preventing full system compromise in many cases, an out-of-bounds write can still lead to information disclosure, denial of service through crashes, or potentially privilege escalation if combined with other vulnerabilities or specific browser configurations. Attackers may leverage this weakness as part of a multi-stage attack chain, using the initial code execution within the sandboxed renderer process to attempt further exploitation against less protected processes or to exfiltrate sensitive user data stored in memory. The ability to execute arbitrary code outside the intended scope highlights the importance of rigorous input validation and bounds checking in complex multimedia processing libraries.
To mitigate this risk, users are strongly advised to update Google Chrome immediately to version 155.0.8059.39 or later, where these boundary checks have been corrected by the development team. Security administrators should ensure that automatic updates are enabled for all endpoints within their networks to minimize exposure windows. Additionally, employing browser hardening techniques such as disabling unnecessary plugins and restricting script execution in untrusted zones can reduce the attack surface. From a defensive engineering standpoint, this incident underscores the necessity of continuous fuzzing and static analysis focused on media parsing routines to detect similar memory safety issues before they reach production builds. The vulnerability aligns with CWE-787, which describes out-of-bounds write conditions, and its exploitation vector relates to ATT&CK techniques involving initial access through web-based delivery mechanisms, emphasizing the need for vigilant monitoring of browser update statuses across organizational infrastructure.