CVE-2026-106315 in Chrome
Summary
by MITRE • 10/06/2026
Use after free in Modularization in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to execute arbitrary code inside 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 a use-after-free error within the Modularization component of Google Chrome prior to version 155.0.8059.39 represents a critical memory management flaw that undermines the browser's sandboxing mechanisms. This specific class of vulnerabilities occurs when a program continues to use a pointer after the memory it points to has been freed, often leading to undefined behavior that can be exploited by malicious actors. In this instance, the defect resides in how Chrome handles modularized components during web page rendering or script execution. When an attacker crafts a specifically designed HTML page containing malicious JavaScript and DOM manipulation techniques, they can trigger conditions where memory is deallocated while still being referenced by active processes within the browser's renderer process. This discrepancy allows for arbitrary read and write operations on heap memory, which serves as the foundational building block for more severe exploits such as code execution.
From a technical perspective, this flaw aligns with Common Weakness Enumeration identifier CWE-416, Use After Free. The exploitation of this vulnerability typically involves precise timing attacks where the attacker controls the allocation and deallocation cycles to ensure that freed memory is reallocated by another object under their control or contains predictable data structures. By manipulating these heap layouts, an adversary can overwrite function pointers or virtual table entries within critical browser components. Since Chrome employs a multi-process architecture with strict sandboxing to isolate untrusted web content from the operating system, bypassing this isolation requires achieving arbitrary code execution within the renderer process and then escaping that sandbox environment. The successful exploitation of this use-after-free condition provides the necessary primitives for an attacker to gain control over the browser's internal state, potentially leading to a full sandbox escape.
The operational impact of this vulnerability is severe due to its potential for remote code execution via a crafted web page. An attacker does not need physical access or user interaction beyond visiting a malicious site, making it suitable for drive-by download attacks and targeted phishing campaigns. If the sandbox boundary is breached, an adversary could execute arbitrary commands on the victim's machine with the privileges of the current user. This could result in data theft, installation of persistent malware, lateral movement within a network if the compromised device is part of one, or complete system compromise depending on the user's privilege level. The Chromium security severity rating of Medium reflects that while exploitation requires specific conditions and potentially multiple stages to achieve sandbox escape, the underlying memory corruption issue itself is highly dangerous and widely exploitable in modern browsers where complex JavaScript engines interact with native code components.
To mitigate this risk, users must ensure their Google Chrome installation is updated to version 155.0.8059.39 or later immediately upon availability. This update contains patches that correct the memory management logic within the Modularization component, ensuring that pointers are properly nullified after deallocation and preventing access to freed memory regions. For organizations managing large fleets of devices, deploying this patch through centralized endpoint management systems is essential to reduce the attack surface against social engineering or drive-by exploitation attempts. Additionally, security teams should monitor for indicators of compromise associated with browser exploit kits that target known vulnerabilities in Chromium-based browsers. While technical mitigations like sandboxing and heap hardening features such as ASLR provide layers of defense, they are not foolproof; therefore, keeping software up to date remains the most effective primary control against memory corruption vulnerabilities classified under CWE-416 and mapped to ATT&CK techniques involving initial access via browser exploitation.