Description

Buffer overflow in Blink in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-25T21:18:15.650Z",
  "pubdate": "2026-08-25T21:18:15.650Z",
  "executiveSummary": "This vulnerability is a buffer overflow flaw identified within the Blink rendering engine of Google Chrome, specifically affecting versions prior to 152.0.7977.65.\nThe vulnerability occurs within the renderer process, where improper handling of memory bounds allows a remote attacker to induce an overflow condition.\nSuccessful exploitation enables an attacker to execute arbitrary code within the constraints of the browser's sandbox environment.\nThe risk is classified as Medium, as it requires an attacker to already have compromised the renderer process or successfully lure a user into visiting a crafted HTML page.\nThe impact is significant as it provides a pathway for code execution, potentially serving as a primitive for further sandbox escape attempts or data exfiltration.\nUsers and administrators are advised to update to version 152.0.7977.65 or later to mitigate the risk associated with this security flaw.",
  "technicalDetails": "The vulnerability resides in the Blink rendering engine, the core component of Chromium responsible for parsing and rendering HTML content.\nA buffer overflow occurs when the application attempts to write data beyond the allocated boundaries of a fixed-length buffer within the process memory space.\nIn this specific instance, the issue is triggered when the renderer process handles specially crafted HTML content that exploits insecure memory management routines during parsing or layout.\nThe exploitation flow begins with an attacker hosting a malicious HTML page designed to trigger the specific memory corruption flaw within the Blink engine.\nWhen a user navigates to the crafted page, the browser's renderer process parses the malicious content, causing the buffer overflow condition.\nBy carefully structuring the payload, an attacker can overwrite adjacent memory structures, such as function pointers or return addresses on the stack, to hijack the control flow of the application.\nSince the execution occurs within the renderer process, the attacker is limited by the sandbox security model; however, successful execution of arbitrary code within this context is a critical security breach.\nThe lack of memory safety in the underlying C++ code handling complex HTML/CSS structures allows for this memory corruption to manifest.\nThe exploitation does not require authentication, but it does require the attacker to successfully coerce the victim into interacting with the malicious content, which is typical for client-side browser vulnerabilities.\nPost-exploitation, the attacker gains the ability to execute code in the context of the renderer process, which can be leveraged to access process-local data, scrape sensitive information displayed in the current tab, or act as an initial foothold for chained exploits aiming to escape the sandbox to gain further persistence or OS-level access.\nThis vulnerability highlights the ongoing challenge of maintaining memory integrity in high-performance rendering engines dealing with untrusted, highly dynamic web content."
}