CVE-2026-113063 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation 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: Low)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within the Chromoting component of Google Chrome prior to version 156.0.8078.47 represents a significant breach in the browser's defense-in-depth strategy, specifically targeting the isolation mechanisms that protect user data and system integrity from untrusted web content. This security issue stems from insufficient sanitization or type-checking procedures applied to inputs processed by the Chromoting module, which is responsible for facilitating remote desktop sharing functionalities within the Chromium-based ecosystem. When a malicious actor crafts an HTML page designed to exploit this weakness, they can manipulate internal data structures or memory states in ways that bypass expected validation logic, thereby creating conditions ripe for arbitrary code execution despite the presence of sandboxing protections.
From a technical perspective, improper input validation often leads to classic memory corruption vulnerabilities such as buffer overflows, use-after-free errors, or type confusion issues when the application processes unexpected data formats or boundary values. In the context of Chromoting, which handles complex streams of remote display and control inputs, failure to strictly validate these inputs can allow an attacker to overwrite critical pointers or execute shellcode within a process that should be heavily restricted by sandbox policies. Although the Chromium security severity is classified as Low, indicating that exploitation may require specific conditions or limited impact on the overall system stability, the potential for arbitrary code execution inside the sandbox remains a serious concern because it undermines the fundamental principle of least privilege enforced by modern browser architectures.
The operational impact of this vulnerability allows a remote attacker to potentially gain unauthorized access to resources within the user's session if they can successfully trick a victim into visiting a malicious webpage or opening a crafted document that triggers the vulnerable code path via Chromoting APIs. This could lead to data exfiltration, installation of persistent malware, or further lateral movement within an enterprise environment where Chrome is widely deployed for remote access tools. The ability to execute arbitrary code inside the sandbox suggests that while full system compromise might not be immediate without additional exploits targeting other layers like kernel vulnerabilities, the attacker achieves a foothold that can be leveraged in conjunction with other weaknesses to escalate privileges or bypass security controls entirely.
To mitigate this risk and align with industry standards such as CWE-20 Improper Input Validation and ATT&CK techniques related to initial access and execution via web browsers, organizations should prioritize immediate patching of all Chrome instances to version 156.0.8078.47 or later where these validation checks have been hardened by the Chromium team. Security administrators must also enforce strict content security policies that restrict the loading of untrusted scripts and disable unnecessary browser features like Chromoting if they are not actively required for business operations, thereby reducing the attack surface available to remote adversaries. Regular vulnerability scanning and monitoring for indicators of compromise associated with exploit kits targeting known Chrome flaws will further enhance defensive posture against such input validation bypasses.