CVE-2026-19177 in Chrome
Summary
by MITRE • 08/07/2026
Insufficient validation of untrusted input in UI in Google Chrome prior to 151.0.7922.109 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 08/07/2026
This vulnerability represents a critical sandbox escape flaw in Google Chrome's user interface component that existed prior to version 151.0.7922.109. The issue stems from inadequate validation of untrusted input within the browser's UI rendering system, creating a pathway for attackers who have already compromised the renderer process to potentially break out of the sandbox environment. The vulnerability is classified as high severity by Chromium security standards, indicating significant risk to user systems and data integrity.
The technical flaw manifests when Chrome processes untrusted HTML content through its user interface components without proper input validation mechanisms. When an attacker successfully compromises the renderer process through other attack vectors, they can craft malicious HTML pages that exploit this insufficient validation to execute code outside of the intended sandbox boundaries. This represents a fundamental failure in Chrome's security architecture where the boundary between trusted and untrusted code becomes porous due to inadequate input sanitization.
The operational impact of this vulnerability extends beyond typical browser exploitation scenarios, as it enables attackers to bypass multiple layers of security protection that are designed to isolate different components of the browser. Once an attacker achieves a sandbox escape through this vector, they gain elevated privileges that could allow access to system resources, file systems, or other applications running on the compromised machine. The vulnerability essentially undermines the core principle of process isolation that modern browsers implement to protect users from malicious content.
This flaw aligns with CWE-20, which describes improper input validation as a fundamental security weakness in software systems. From an adversarial perspective, this vulnerability maps to several ATT&CK techniques including T1059 for command and script interpreter execution, T1070 for indicator removal on host, and T1484.001 for abuse of function virtualization. The attack chain typically begins with initial compromise of the renderer process through phishing or drive-by downloads, followed by delivery of the malicious HTML payload that exploits this input validation weakness to escape sandbox boundaries.
Organizations should prioritize immediate patching of Chrome installations to version 151.0.7922.109 or later to remediate this vulnerability. Additional mitigations include implementing network-based protections such as web application firewalls and content filtering systems, along with user education about phishing risks and suspicious website interactions. Security teams should also consider monitoring for unusual process behavior or unauthorized access attempts that might indicate exploitation attempts. Regular security assessments of browser configurations and enforcement of strict security policies can further reduce the risk surface associated with this class of vulnerabilities.