CVE-2026-113162 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in Actor 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)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within the Actor component of Google Chrome prior to version 156.0.8078.47 represents a significant breach in the browser's defense-in-depth architecture. This specific issue stems from insufficient sanitization or type-checking mechanisms applied to data inputs processed by the Actor subsystem, which is responsible for handling various asynchronous operations and message passing between different parts of the Chromium engine. When an attacker crafts a malicious HTML page containing specially constructed input payloads, they can exploit this lack of validation to bypass expected constraints on memory allocation or object instantiation. The core technical flaw lies in the failure to rigorously verify that incoming data conforms to the strict type definitions and boundary conditions required by the underlying C++ codebase, allowing for potential heap corruption or logic errors during execution.
From a security classification perspective, this vulnerability aligns with CWE-20 Improper Input Validation, as it involves accepting external input without adequate checks on format, length, or content integrity. Furthermore, because the exploit vector allows an attacker to trigger arbitrary code execution within the browser's sandboxed environment, it maps directly to MITRE ATT&CK technique T1203 Exploitation for Client Execution. The medium severity rating assigned by Chromium reflects the complexity of the exploitation chain required and the mitigating factors present in modern browsers, such as hardware-level isolation features like ASLR and DEP, which make successful exploitation more difficult than in older browser versions but do not eliminate the risk entirely.
The operational impact of this vulnerability is severe due to its remote nature. A user who visits a maliciously crafted website or clicks on a link leading to such content can trigger the exploit without any additional interaction required from them. If successfully exploited, an attacker could execute arbitrary code within the context of the browser process. Although Chrome employs sandboxing to limit the damage caused by renderer processes, breaking out of this sandbox remains a critical threat vector for advanced persistent threats and drive-by download attacks. Successful exploitation could lead to unauthorized access to sensitive user data, installation of malware, or further lateral movement within a compromised network if the attacker manages to escape the browser's isolation boundaries.
Mitigation strategies primarily involve immediate software updates. Users must upgrade Google Chrome to version 156.0.8078.47 or later, where this input validation logic has been corrected and hardened against such bypass attempts. In environments where automatic updating is not feasible, administrators should enforce strict patch management policies to ensure all endpoints are running the latest stable release of Chromium-based browsers. Additionally, deploying browser isolation solutions or web content filtering proxies can provide an additional layer of defense by blocking access to known malicious domains or inspecting traffic for exploit signatures before they reach the client-side rendering engine. Security awareness training should also be maintained to educate users about the risks associated with visiting untrusted websites and opening suspicious attachments that may host such crafted HTML pages.