Description

Improper input validation in Media in Google Chrome prior to 152.0.7977.65 allowed a remote attacker 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": "8.8",
  "pubDate": "2026-08-25T21:18:11.813Z",
  "pubdate": "2026-08-25T21:18:11.813Z",
  "executiveSummary": "This vulnerability involves an improper input validation flaw within the Media component of Google Chrome prior to version 152.0.7977.65. The flaw allows a remote, unauthenticated attacker to execute arbitrary code outside the browser's sandbox environment.\nThe vulnerability is classified as a critical security concern due to the capability of achieving code execution on the underlying host operating system. The attack is triggered when a user navigates to a maliciously crafted HTML page, making it a significant risk for drive-by download or phishing campaigns.\nThe scope of impact extends beyond the browser's security boundary, effectively bypassing the Chromium sandbox. Successful exploitation necessitates user interaction—specifically visiting a compromised or attacker-controlled website. Organizations are advised to update affected systems immediately to mitigate the risk of host-level system compromise.",
  "technicalDetails": "The root cause of this vulnerability lies in insufficient input validation routines within the Media processing subsystem of Google Chrome. Specifically, the component responsible for handling media-related data structures fails to properly sanitize or validate input supplied via HTML-based media elements. This failure to enforce strict boundary checks during the parsing or rendering phases introduces memory safety issues, which can be leveraged to corrupt the internal state of the application process.\nThe exploitation flow typically begins when an attacker hosts a specially crafted HTML document containing malicious media content designed to exploit the input validation error. Upon the victim navigating to this page, the browser's Media component processes the malformed data. Due to the lack of adequate validation, the process triggers a memory corruption primitive, such as a heap buffer overflow or a use-after-free, within the context of the Media handler.\nBecause the vulnerability exists in the handling of media data, it provides an entry point for an attacker to redirect execution flow. By carefully crafting the heap layout or exploiting predictable memory addresses, the attacker can hijack the instruction pointer (EIP/RIP) to redirect program execution to a malicious payload. This payload, if executed, operates with the privileges of the rendering process initially; however, the vulnerability specifically allows the attacker to break out of the Chromium sandbox environment.\nSandbox escape is the most severe aspect of this vulnerability, as it allows the attacker to transition from the constrained, low-privilege rendering process to the underlying operating system environment. Post-exploitation, the attacker gains the ability to execute arbitrary commands, install persistent malware, or access sensitive user data residing on the local filesystem. No authentication or elevated user privileges are required for the initial trigger; the browser acts as the primary vector for the remote attacker to achieve unauthorized access to the host machine. Given the nature of Chromium's architecture, this implies a fundamental breakdown in the isolation mechanisms intended to protect the host environment from malicious web-based input."
}