CVE-2026-113342 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Network in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 10/21/2026
The vulnerability described constitutes a critical memory corruption flaw within the Network component of Google Chrome, specifically affecting versions prior to 156.0.8078.47. This defect represents a significant deviation from expected software behavior where improper handling of network-related data structures leads to unauthorized access or modification of system memory. The severity is classified as Medium by Chromium security standards, yet the potential for remote code execution outside the browser's sandbox environment elevates its practical risk profile considerably higher than typical medium-severity findings. Such vulnerabilities typically arise from errors in how the browser processes incoming network traffic, including HTTP responses, WebSocket frames, or other protocol-specific payloads that interact with internal memory management subsystems.
At a technical level, this vulnerability likely involves an out-of-bounds write or use-after-free condition within the networking stack. When a user visits a maliciously crafted HTML page containing specially designed JavaScript and network requests, the browser's rendering engine and network layer process these inputs without adequate bounds checking or lifecycle management for allocated memory buffers. This allows an attacker to corrupt adjacent memory structures, potentially overwriting function pointers, object headers, or other critical control data within the Chrome process space. The exploitation of such a flaw enables arbitrary code execution because the corrupted memory can be manipulated to redirect program flow to shellcode injected by the attacker, thereby bypassing standard security controls that rely on intact memory layouts for protection.
The operational impact of this vulnerability is severe due to its ability to escape the browser sandbox. Modern web browsers employ strict sandboxing mechanisms designed to isolate untrusted content from the underlying operating system and user data. By executing arbitrary code outside this sandbox, an attacker gains a level of privilege that allows them to interact directly with the host operating system's kernel or user-level applications. This can lead to full system compromise, including the theft of sensitive credentials stored in password managers, installation of persistent malware such as keyloggers or ransomware, and lateral movement within a corporate network if the victim is part of an enterprise environment. The attack vector being remote via HTML means that no additional software installation or user interaction beyond visiting a webpage is required, making it highly scalable for drive-by download attacks.
From a classification perspective, this vulnerability aligns with CWE-120 Buffer Overflow without null termination and CWE-416 Use After Free, which are common root causes of memory corruption issues in complex C++ applications like Chrome browsers. In the context of the MITRE ATT&CK framework, this exploit falls under Tactic 7 Command and Control for establishing persistent access or Tactic 3 Persistence if used to install backdoors, specifically leveraging techniques related to browser exploitation such as T1508 Exploitation through Remote Services. The ability to execute code outside the sandbox also touches upon privilege escalation concepts found in Tactic 6 Privilege Escalation, although primarily it serves as an initial access vector that bypasses isolation boundaries defined by Tactic 2 Execution and its associated browser-based techniques like T1059 Command and Scripting Interpreter.
Mitigation strategies for this vulnerability are twofold: immediate patching and long-term architectural improvements. The primary defense is to update Google Chrome to version 156.0.8078.47 or later, which contains the necessary code fixes to address the memory management errors in the Network component. Organizations should enforce automated browser updates across all endpoints to ensure rapid remediation against known exploits. Additionally, implementing strict Content Security Policy headers can help mitigate some aspects of web-based attacks by restricting the sources from which scripts and other resources are loaded, although this does not directly prevent exploitation of low-level memory corruption flaws within the browser engine itself. For enterprise environments, deploying endpoint detection and response solutions with behavioral analysis capabilities can identify anomalous process creation patterns indicative of sandbox escape attempts, providing a secondary layer of defense against successful exploits of such vulnerabilities.