Description

Improper input validation in Input in Google Chrome on on Android prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.3",
  "pubDate": "2026-08-25T21:18:08.467Z",
  "pubdate": "2026-08-25T21:18:08.467Z",
  "executiveSummary": "This vulnerability involves an improper input validation flaw within the Input component of Google Chrome on Android, occurring prior to version 152.0.7977.65.\nThe vulnerability is classified as a security defect where inadequate validation of incoming data allows an attacker who has already achieved code execution within the renderer process to escape the Chromium sandbox.\nThe primary impact is the potential execution of arbitrary code on the underlying host operating system, effectively bypassing the browser's security boundary.\nThe vulnerability necessitates that an attacker first compromises the renderer process, typically through a separate exploit chain such as a memory corruption vulnerability within the browser's engine.\nUpon successful exploitation, the attacker escalates privileges from the sandboxed environment to the system level, posing a significant risk to user data and device integrity.\nThe flaw highlights the critical nature of robust input sanitization at the boundary between the renderer process and higher-privilege system components.",
  "technicalDetails": "The root cause of this vulnerability lies in improper input validation logic residing within the Input component of Google Chrome for Android. In the Chromium architecture, the renderer process is strictly isolated from the operating system via a sandbox mechanism designed to prevent malicious code from accessing system resources. This vulnerability specifically targets the communication interface or data handling logic that bridges the renderer process and the browser or GPU process.\nExploitation follows a specific, multi-stage attack flow. First, an attacker must successfully exploit an initial vulnerability, such as a use-after-free or buffer overflow, to gain remote code execution (RCE) within the restricted renderer process. Once the attacker controls the renderer process, they leverage the identified input validation flaw to send a malformed or crafted payload to the privileged process. Because the input validation routine fails to sanitize or verify the integrity of the data being passed, the privileged process inadvertently processes the crafted input in a way that leads to memory corruption or logic errors.\nSpecifically, the attacker crafts a malicious HTML page that, when rendered, triggers the flawed input handling sequence. By supplying unexpected or malformed data structures during the Inter-Process Communication (IPC) calls, the attacker can manipulate memory pointers or trigger unauthorized system calls outside the intended sandbox boundaries. This effectively allows the attacker to break out of the renderer sandbox and execute arbitrary instructions on the Android host environment with the permissions of the browser application.\nThe affected component is the Input processing module, which is a critical subsystem responsible for interpreting user interactions and data inputs. Any version of Google Chrome on Android prior to 152.0.7977.65 is susceptible to this bypass. The attack does not require authentication from the user beyond visiting the malicious page, but it does require the renderer to be successfully compromised as a prerequisite. Post-exploitation, the attacker gains the ability to execute arbitrary code, which may lead to complete device compromise, installation of persistent threats, or unauthorized access to sensitive application data stored on the device."
}