Description

Integer overflow in Chromecast in Google Chrome 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: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.3",
  "pubDate": "2026-08-25T21:18:23.417Z",
  "pubdate": "2026-08-25T21:18:23.417Z",
  "executiveSummary": "A high-severity integer overflow vulnerability exists in the Chromecast component of Google Chrome prior to version 152.0.7977.65.\nThe vulnerability originates within the renderer process, allowing a remote attacker to bypass sandbox constraints.\nSuccessful exploitation enables arbitrary code execution on the underlying host system, presenting a significant security risk to the browser environment.\nExploitation requires the attacker to initially compromise the renderer process, typically via a crafted HTML page containing malicious content.\nThe vulnerability highlights a critical failure in memory safety during inter-process communication or data handling within the Chromecast subsystem.\nGiven the nature of Chromium's architecture, this flaw effectively invalidates the browser sandbox, potentially leading to full system compromise depending on the user's privilege level and host platform security configurations.",
  "technicalDetails": "The vulnerability is classified as an integer overflow occurring within the Chromecast implementation integrated into the Chromium browser engine. Integer overflows occur when an arithmetic operation attempts to create a numeric value that is outside the range that can be represented with a given number of bits. In this context, the overflow likely occurs during the calculation of buffer sizes or memory offsets when processing media streams or metadata provided by a remote source.\nThe attack flow begins with the delivery of a specially crafted HTML page to the victim, which is rendered by the Chromium process. If an attacker has already achieved remote code execution within the renderer process—for example, by chaining this with a separate exploit or utilizing common browser-based vectors—they can then target the Chromecast component. The renderer process, while sandboxed, interacts with the Chromecast component to manage media casting functionality.\nBy supplying carefully calculated inputs that trigger an integer overflow, an attacker can cause the subsequent memory allocation to be smaller than the actual data being processed. This leads to a heap-based buffer overflow condition. When the application attempts to write the excess data into the undersized heap buffer, it overwrites adjacent memory structures.\nIn the context of the Chromecast subsystem, this memory corruption allows an attacker to overwrite critical data, such as function pointers or object vtables. By redirecting the flow of execution, the attacker can hijack the control flow of the application. Because the execution occurs within the context of the Chromecast process—which often possesses higher system-level privileges or access paths than the restricted renderer—the attacker successfully escapes the Chromium sandbox.\nThe impact of this exploit is the potential for arbitrary code execution outside the sandbox. An attacker can execute payloads ranging from spyware to persistent malware with the privileges of the browser process. This bypasses the primary security boundary of Chromium, which is designed to isolate malicious web content from the host operating system. The vulnerability is highly technical, relying on precise control over heap layout and the ability to trigger specific memory-intensive operations through the Chromecast API interface."
}