CVE-2026-110140 in Chrome
Summary
by MITRE • 10/13/2026
Type confusion in V8 in Google Chrome prior to 155.0.8059.79 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as a type confusion flaw within the V8 JavaScript engine, which powers Google Chrome prior to version 155.0.8059.79, represents a critical failure in memory safety and runtime type checking mechanisms. Type confusion vulnerabilities occur when an application incorrectly assumes that a variable or object contains data of one specific type while it actually holds data of another incompatible type. In the context of V8, this typically involves the engine's Just-In-Time compiler failing to correctly track or enforce type information for objects during execution. When an attacker crafts a malicious HTML page containing specially designed JavaScript code, they can manipulate these internal representations to trick the browser into treating memory allocated for one data structure as another. This misinterpretation allows the attacker to read from and write to arbitrary locations in the process's memory space, bypassing the intended boundaries between different objects or security zones within the browser environment.
The operational impact of this vulnerability is severe because it facilitates remote code execution with high privilege levels relative to the user context. Since V8 operates within a sandboxed environment designed to isolate web content from the underlying operating system, successfully exploiting a type confusion bug allows an attacker to break out of these restrictions or escalate privileges within the browser's process space. By crafting specific heap layouts and triggering precise memory operations through the flawed JavaScript execution path, an adversary can achieve arbitrary code execution inside the sandbox. This capability enables the installation of malware, theft of sensitive data such as cookies and session tokens stored in local storage, and further lateral movement if additional vulnerabilities are present or if the browser's security model is compromised. The Chromium project has classified this issue with a High severity rating due to its potential for widespread exploitation via standard web browsing activities without requiring user interaction beyond visiting a malicious site.
From a classification perspective, this vulnerability aligns closely with CWE-843, which describes access to incorrect type assumption errors, and specifically relates to the broader category of memory corruption vulnerabilities often associated with CWE-120 buffer overflows or CWE-787 out-of-bounds writes when the type confusion leads to improper pointer arithmetic. In terms of attack vectors, this exploit falls under MITRE ATT&CK technique T1059 Command and Scripting Interpreter, as it leverages JavaScript execution within a web context to perform malicious actions. Furthermore, the exploitation path likely involves techniques categorized under T1203 Exploitation for Client Execution, where the initial access is gained through user interaction with a crafted webpage that triggers the vulnerability in the client-side software. The lack of proper bounds checking or type validation during JIT compilation phases allows the attacker to construct a reliable exploit chain that leads directly to code execution.
Mitigation strategies primarily involve updating Google Chrome and its underlying V8 engine components to version 155.0.8059.79 or later, where these specific type confusion issues have been patched by enforcing stricter runtime checks and improving the accuracy of hidden class tracking in the JIT compiler. Organizations should ensure that endpoint protection solutions are configured to detect suspicious JavaScript execution patterns indicative of exploitation attempts for this vulnerability. Additionally, users can employ browser hardening techniques such as disabling unnecessary plugins or scripts, utilizing sandboxing extensions where available, and maintaining strict control over which websites are permitted to execute complex client-side code. Regular patch management cycles are essential to address these types of memory safety flaws promptly, given their prevalence in modern web browsers and the high impact associated with successful exploitation via remote vectors.