CVE-2026-113258 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Chromoting in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified within the Chromium-based browser architecture, specifically affecting components related to Chromoting prior to version 156.0.8078.47, represents a critical memory corruption flaw that undermines the integrity of the application's execution environment. This defect is classified as having medium severity by the Chromium security team but carries significant risk due to its potential for remote code execution within a sandboxed context. The core technical issue stems from improper handling of memory allocation and deallocation processes during the processing of specific data structures associated with screen sharing or remote desktop functionalities embedded in web pages. When an attacker crafts a malicious HTML page containing specially constructed inputs, they can trigger conditions where the browser fails to properly validate buffer boundaries or reference counts before performing operations on these memory regions. This lack of rigorous input validation and bounds checking leads to scenarios such as heap overflow or use-after-free errors, which are among the most dangerous classes of software vulnerabilities in modern web browsers.
From a technical perspective, this flaw allows for arbitrary code execution by exploiting the way the browser manages dynamic memory during the rendering and interaction phases of the malicious content. By carefully crafting the payload within the HTML page, an attacker can manipulate pointers to point to controlled data structures rather than valid application memory. This manipulation enables the injection and subsequent execution of shellcode or other malicious instructions directly into the process space of the Chrome browser. Although modern browsers employ extensive sandboxing mechanisms designed to isolate web content from the underlying operating system, a successful exploitation of this vulnerability can potentially allow an attacker to escape these restrictions if they combine it with additional techniques targeting kernel vulnerabilities or misconfigured security policies. The ability to execute code inside the sandbox significantly elevates the threat level, as it provides the initial foothold necessary for further lateral movement within a user's environment.
The operational impact of this vulnerability is severe, particularly in enterprise environments where Chrome is used extensively for remote work and collaboration tools that rely on Chromoting capabilities. A successful exploit could lead to full system compromise if the sandbox escape conditions are met, allowing attackers to install malware, steal sensitive credentials, or establish persistent access to targeted systems. The attack vector being a crafted HTML page means it can be delivered through various social engineering tactics, including phishing emails with malicious links, compromised websites, or drive-by downloads that automatically load when a user visits a rogue site. This ease of delivery combined with the high impact makes it a priority target for threat actors seeking to conduct large-scale campaigns against organizations using Chrome-based infrastructure.
To mitigate this risk, immediate action is required to update all instances of Google Chrome and Chromium-based browsers to version 156.0.8078.47 or later, where the underlying memory management routines have been patched to enforce stricter bounds checking and validation protocols. Organizations should also consider implementing application whitelisting policies to restrict the execution of unsigned scripts within browser contexts, thereby reducing the attack surface available to exploit this vulnerability. Additionally, deploying advanced endpoint detection and response solutions can help identify anomalous behavior patterns associated with memory corruption exploits, such as unusual heap allocations or pointer dereferences in non-standard memory regions. Regular security awareness training for employees regarding phishing attempts remains a vital complementary control to prevent initial access via malicious web content.
This incident aligns with Common Weakness Enumeration (CWE) categories related to improper input validation and buffer overflows, specifically CWE-120 Buffer Copy without Checking Size of Input and CWE-416 Use After Free. In terms of the MITRE ATT&CK framework, this vulnerability facilitates techniques associated with Initial Access through spearphishing links or drive-by compromise, followed by Execution via browser-based script execution. The exploitation path typically involves Discovery to identify vulnerable targets, followed by Privilege Escalation if sandbox escape is achieved, and ultimately Command and Control setup for persistent access. Understanding these mappings helps security teams prioritize remediation efforts based on the broader tactical implications of such memory corruption flaws in web browsers.