CVE-2026-113306 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in Network in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within the Network component of Google Chrome prior to version 156.0.8078.47 represents a significant breach in the browser's defensive perimeter, specifically targeting the isolation mechanisms that protect user data and system integrity from untrusted web content. This issue stems from insufficient sanitization or type-checking procedures applied to network-related inputs processed by the Chromium engine, allowing maliciously crafted HTML pages to bypass expected validation logic. When a victim is tricked into visiting a specially constructed webpage, the browser's networking stack processes malformed data structures that were not properly validated against their expected formats or boundaries. This failure in input handling enables an attacker to manipulate internal state variables or memory allocations within the network module, leading to conditions where arbitrary code execution becomes possible despite the presence of sandboxing protections.
From a technical perspective, this vulnerability aligns with CWE-20 Improper Input Validation and potentially CWE-119 Memory Corruption based on the nature of the exploit chain required for remote code execution. The attacker leverages the crafted HTML page to trigger specific network requests or responses that contain malformed data packets or headers. These inputs are processed by components responsible for managing HTTP/HTTPS connections, WebSocket upgrades, or other network protocols integrated into Chrome's architecture. Because the input validation logic fails to reject these anomalous payloads early in the processing pipeline, the vulnerability allows for memory corruption or control flow hijacking within the sandboxed renderer process. Although Chromium employs a multi-process architecture with strict sandboxes designed to limit the impact of such exploits, sophisticated attackers can often chain multiple vulnerabilities or exploit edge cases in system calls and kernel interactions to escape the sandbox environment, thereby achieving arbitrary code execution on the host operating system.
The operational impact of this vulnerability is severe due to its remote nature and potential for privilege escalation from a low-privilege browser context to full system control. An attacker who successfully exploits this flaw can execute arbitrary commands with the privileges of the user running the browser application, potentially leading to data theft, installation of persistent malware, or use of the compromised machine as part of a botnet. The severity is classified as Low by Chromium security standards primarily because successful exploitation may require specific conditions such as particular operating system configurations, enabled features, or additional helper vulnerabilities that are not always present in default setups. However, given the widespread adoption of Chrome and its role as a primary gateway to internet resources, even low-severity remote code execution flaws pose substantial risk due to their ease of distribution via phishing campaigns or compromised websites.
Mitigation strategies for this vulnerability involve immediate updates to the browser software to ensure that all users are running version 156.0.8078.47 or later, where the input validation logic in the Network component has been corrected and hardened against such malformed inputs. Organizations should enforce automated patch management policies to minimize exposure windows for end-users who may not manually update their browsers regularly. Additionally, security teams can implement browser hardening techniques such as disabling unnecessary plugins or extensions that might interact with network components, configuring strict content security policies where applicable, and utilizing endpoint detection and response solutions capable of monitoring for anomalous process creation patterns indicative of sandbox escape attempts. Awareness training should also be conducted to reduce the likelihood of users interacting with suspicious links that could serve as vectors for this exploit.
This incident underscores the importance of rigorous input validation in complex software systems like web browsers, where every component must strictly adhere to expected data formats and boundaries. The ATT&CK framework categorizes such activities under T1059 Command and Scripting Interpreter if code execution is achieved, or potentially T1203 Exploitation for Client Execution when targeting the browser itself. By addressing these vulnerabilities promptly through software updates and maintaining robust security hygiene practices, organizations can significantly reduce their attack surface against remote exploitation attempts that target fundamental web browsing infrastructure components.