CVE-2026-17684 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Chrome for iOS in Google Chrome on iOS prior to 151.0.7922.72 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 • 07/30/2026
This vulnerability represents a critical sandbox escape flaw in Google Chrome for iOS affecting versions prior to 151.0.7922.72. The issue stems from inadequate validation of untrusted input within the browser's rendering engine, specifically exposing a pathway for malicious actors who have already compromised the renderer process to potentially break out of the sandboxed environment that normally isolates browser components. The vulnerability operates at the intersection of privilege escalation and sandbox bypass techniques, where an attacker with initial access to the renderer process can leverage this weakness to gain broader system access. This flaw aligns with CWE-20, which addresses improper input validation, and represents a sophisticated attack vector that undermines Chrome's security model designed to contain potential exploits within isolated processes.
The technical implementation of this vulnerability occurs when Chrome processes crafted HTML content that bypasses normal input sanitization mechanisms. Attackers can construct malicious web pages containing specially formatted elements or scripts that exploit the insufficient validation controls, allowing arbitrary code execution outside the intended sandbox boundaries. The renderer process, which handles untrusted web content, becomes a potential entry point for attackers who have already achieved initial compromise through other means such as drive-by downloads or phishing attacks. This vulnerability demonstrates how even when attackers have limited access to system resources, inadequate input validation can provide them with additional attack surface to escalate privileges and expand their control over the target system.
The operational impact of this vulnerability extends beyond simple browser exploitation to potentially compromise the entire iOS device when Chrome for iOS is used as a primary browsing application. Users who visit malicious websites or are directed to compromised web pages could inadvertently trigger the exploit, leading to unauthorized access to sensitive data, potential surveillance capabilities, and broader system control. The threat landscape for this vulnerability includes advanced persistent threat actors, cybercriminals targeting mobile devices, and nation-state actors who may leverage such techniques as part of multi-stage attack campaigns. Organizations relying on Chrome for iOS for business productivity or security monitoring face increased risk exposure when systems are running vulnerable versions.
Mitigation strategies should prioritize immediate patching to the latest Chrome for iOS version that addresses this vulnerability through enhanced input validation controls and strengthened sandbox boundaries. System administrators should implement comprehensive monitoring for suspicious web traffic patterns, particularly when users access untrusted websites or download content from unknown sources. Network security measures including web content filtering and proxy server configurations can provide additional layers of protection by blocking known malicious domains and content. The fix typically involves implementing stricter input sanitization protocols and enhancing the renderer process isolation mechanisms to prevent potential escape vectors. Security teams should also conduct regular vulnerability assessments targeting mobile browser environments, ensuring that all components within the iOS ecosystem maintain current security postures. Organizations may need to consider temporary restrictions on browsing activities or deployment of alternative secure browsers for high-risk operations until complete patch coverage is achieved across all affected devices and operating systems. This vulnerability underscores the critical importance of maintaining up-to-date security patches across all browser environments, particularly mobile platforms where sandboxing mechanisms are increasingly targeted by sophisticated attackers seeking persistent access to sensitive information.