CVE-2026-113230 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in Browser 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: Medium)
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified as an improper input validation flaw within the browser component of Google Chrome prior to version 156.0.8078.47 represents a significant risk vector for remote code execution attacks. This issue stems from insufficient sanitization or type-checking mechanisms when processing user-supplied data, specifically through crafted HTML pages delivered by an attacker. The core technical flaw lies in the browser's ability to parse and execute content without adequately verifying that the input adheres to expected structural and semantic constraints. When a victim visits a maliciously constructed webpage containing specially formatted scripts or markup elements, the browser may interpret these inputs as executable commands rather than static data. This misinterpretation allows an attacker to inject arbitrary code into the rendering engine's execution context, bypassing standard security boundaries that are designed to isolate web content from the underlying operating system.
From a technical perspective, this vulnerability aligns with CWE-20 Improper Input Validation and often overlaps with CWE-74 Injection in contexts where script injection leads to command execution. The attack vector is classified as remote because it requires no prior access or authentication on the target machine; instead, success depends solely on convincing a user to load the malicious page. Once triggered, the injected code attempts to escape the browser's sandbox environment. Modern browsers employ strict sandboxes to limit the privileges of web content, preventing scripts from accessing sensitive system resources such as file systems, network interfaces, or process tables. However, if input validation is flawed, an attacker can exploit parsing ambiguities or logic errors in the rendering engine to break out of this isolation layer. This breakout allows the malicious payload to execute with higher privileges than intended by the sandbox policy, potentially leading full control over the user's environment depending on the browser's configuration and operating system permissions.
The operational impact of such a vulnerability is severe, as it facilitates arbitrary code execution within what should be a restricted context. An attacker leveraging this flaw could install malware, exfiltrate sensitive data stored locally or in cookies, hijack active sessions for web applications, or use the compromised browser as a pivot point to attack other systems on the network. The severity rating of Medium from Chromium indicates that while exploitation requires specific conditions such as user interaction and potentially specific rendering states, the potential consequences are substantial enough to warrant immediate attention. This type of vulnerability is frequently associated with ATT&CK technique T1059 Command and Scripting Interpreter, where attackers use built-in system tools or scripts to execute commands post-exploitation. It may also relate to T1204 User Execution if social engineering is required to get the victim to visit the crafted page, although automated drive-by downloads can sometimes bypass this step entirely depending on browser settings like automatic plugin execution.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary remediation action is to update Google Chrome to version 156.0.8078.47 or later, where the input validation logic has been corrected to properly reject malformed inputs before they reach critical execution paths. For organizations managing large fleets of devices, automated deployment tools should be utilized to ensure rapid distribution of this patch across all endpoints. In addition to patching, security teams should enforce strict content security policies that restrict inline script execution and limit the sources from which scripts can be loaded. This reduces the attack surface by ensuring that even if a vulnerability exists in the browser engine, the injected code cannot execute unless it originates from trusted domains. Furthermore, enabling sandbox enforcement features such as site isolation helps to contain any potential breakout attempts within isolated processes, limiting the blast radius of an exploit. Regular security audits and fuzzing tests on custom or legacy web applications can also help identify similar input validation weaknesses before they are exploited in the wild.