CVE-2026-106341 in Chrome
Summary
by MITRE • 10/07/2026
Type confusion in V8 in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to potentially 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 type confusion issue within the V8 JavaScript engine, which powers Google Chrome prior to version 155.0.8059.39, represents a critical memory safety flaw that undermines the integrity of the browser's execution environment. Type confusions occur when an application incorrectly interprets the data type of a value in memory, leading to operations being performed on data structures as if they were a different type. In the context of V8, this typically involves misinterpreting JavaScript objects or arrays during Just-In-Time compilation or runtime evaluation. When such a confusion is triggered by a crafted HTML page hosted remotely, it allows an attacker to manipulate internal pointers and memory layouts in ways that bypass standard safety checks. This specific flaw was classified with a medium security severity by the Chromium team, indicating that while exploitation requires careful crafting of the malicious payload, the underlying mechanism provides a reliable path for unauthorized code execution within the browser's sandboxed environment.
From a technical perspective, this vulnerability falls under the category of CWE-843, which refers to Accessing Memory with Incorrect Type or Size. The root cause lies in how V8 handles dynamic typing and object shapes during optimization phases. If an attacker can force the engine to treat a pointer as one type when it is actually another, they may achieve arbitrary read-write capabilities within the process memory space. This capability is particularly dangerous because modern browsers rely heavily on sandboxing to isolate web content from the host operating system. By exploiting this flaw, an adversary could potentially escape these isolation boundaries or at least execute code with elevated privileges relative to other tabs and extensions. The attack vector involves a remote attacker delivering a specially constructed HTML page that triggers the type confusion through specific JavaScript patterns designed to confuse the V8 compiler's assumptions about object types.
The operational impact of this vulnerability is significant, as it enables potential arbitrary code execution inside the sandbox. While the sandbox provides layers of defense such as restricted API access and memory protection mechanisms like DEP and ASLR, a successful exploitation could allow an attacker to run malicious scripts with higher privileges than intended for web content. This could lead to data exfiltration, installation of malware, or further pivoting into the host system if additional vulnerabilities are chained together. The medium severity rating reflects that while the vulnerability is exploitable, it may require specific conditions or multiple steps to achieve full control over the process, yet its existence poses a tangible risk to users browsing untrusted websites.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 155.0.8059.39 or later immediately upon availability. This update contains patches for the V8 engine that correct the type checking logic and prevent the misinterpretation of memory structures during execution. Additionally, security teams should enforce strict content security policies and consider deploying browser isolation solutions to limit the blast radius in case a zero-day vulnerability is encountered before patching can occur. Monitoring network traffic for unusual JavaScript payloads or attempts to load suspicious HTML resources from untrusted domains can also provide an additional layer of defense against exploitation attempts targeting this specific flaw.
In terms of industry standards, this incident aligns with ATT&CK technique T1059, specifically the execution of scripts via browser-based methods such as ECMAScript (JavaScript). The vulnerability exploits a weakness in how the runtime environment processes dynamic types, which is a common attack surface for web-based malware and advanced persistent threats seeking to establish initial access or maintain persistence through compromised browsers. Understanding this vector helps security professionals prioritize patch management cycles and enhance monitoring rules focused on detecting anomalous JavaScript execution patterns that deviate from normal user behavior.