CVE-2026-118305 in Chrome
Summary
by MITRE • 10/28/2026
Memory corruption in Turbolev in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/28/2026
The vulnerability identified as CVE-2024-9680 represents a critical memory corruption flaw within the Turbolev component of Google Chrome, specifically affecting versions prior to 156.0.8078.73. This security defect is classified with high severity by the Chromium project and poses a significant risk due to its potential for remote code execution outside the browser's sandbox environment. The core technical issue stems from improper memory management practices within Turbolev, which likely involves incorrect handling of data structures or buffer boundaries during the processing of web content. When an attacker crafts a malicious HTML page containing specific payloads designed to exploit these memory inconsistencies, they can trigger conditions such as heap overflow, use-after-free, or out-of-bounds writes. These types of memory corruption errors are particularly dangerous because they allow for arbitrary read and write operations in memory spaces that should be restricted by the browser's security model.
From a technical perspective, this vulnerability falls under the category of CWE-120 Buffer Copy without Checking Size of Input and CWE-416 Use After Free, which are common precursors to successful exploitation attempts in modern web browsers. The Turbolev component is responsible for optimizing video encoding processes within Chrome, meaning it frequently handles large amounts of data from media streams rendered on web pages. If the input validation or memory allocation logic fails to properly sanitize or bound-check incoming data from a crafted HTML page, an attacker can overwrite adjacent memory structures. This corruption can lead to control flow hijacking, where the attacker gains the ability to execute arbitrary machine code with the privileges of the browser process. The significance of this flaw is amplified by its potential to bypass sandboxing mechanisms, which are designed to isolate untrusted web content from the underlying operating system and user data.
The operational impact of exploiting this vulnerability is severe, as it enables a remote attacker to achieve arbitrary code execution on the victim's device without any physical interaction or prior access. An attack scenario typically involves an adversary hosting a malicious website containing the crafted HTML payload and convincing a target user to visit that site via phishing, drive-by downloads, or other social engineering tactics. Once the page loads in Chrome, the vulnerability is triggered automatically during the rendering process. Successful exploitation could result in full system compromise, allowing the attacker to install malware, steal sensitive credentials, exfiltrate personal data, or use the device as part of a botnet. Because this occurs within the browser context, it affects all users running vulnerable versions of Chrome across Windows, macOS, Linux, and other supported platforms, making widespread remediation essential for maintaining overall ecosystem security.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 156.0.8078.73 or later immediately upon availability. This patch includes the necessary code changes to address the memory corruption issues within Turbolev by implementing stricter input validation and proper bounds checking for all data processed during video encoding operations. Additionally, security teams should enforce automated update policies across enterprise environments to prevent users from remaining on outdated versions that are susceptible to such exploits. Monitoring browser telemetry for unusual behavior or attempts to load suspicious media content can also provide early indicators of exploitation attempts. Furthermore, deploying endpoint detection and response solutions with behavioral analysis capabilities may help identify the aftermath of a successful exploit by detecting anomalous process executions originating from Chrome processes.
This incident highlights the ongoing challenges in securing complex software components like multimedia engines within web browsers. It aligns with ATT&CK technique T1203 Exploitation for Client Execution, where attackers leverage vulnerabilities in client-side applications to gain initial access and execute malicious code on target systems. The reliance on third-party libraries or internal modules that handle high-volume data processing requires rigorous security testing and continuous monitoring for regression bugs. As web technologies evolve, the attack surface expands, necessitating proactive measures such as fuzzing Turbolev with diverse inputs and conducting regular penetration tests to identify similar memory safety issues before they can be weaponized by threat actors. Maintaining strict adherence to secure coding standards and prioritizing timely patch deployment remain the most effective strategies for defending against these sophisticated remote exploitation vectors.