CVE-2026-18002 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Google Lens in Google Chrome 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: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical sandbox escape risk within Google Chrome's rendering engine that could be exploited by attackers who have already compromised the renderer process. The issue stems from insufficient validation of untrusted input in Google Lens functionality, which is integrated into the browser's Chrome environment. When a malicious actor successfully breaches the renderer process through other means, they can leverage this weakness to break out of the sandboxed environment and gain elevated privileges within the operating system. The vulnerability affects Chrome versions prior to 151.0.7922.72 and demonstrates a fundamental flaw in how the browser handles input validation for lens-based features that are designed to process user-generated content.
The technical implementation of this vulnerability involves the improper sanitization of HTML content that gets processed through Google Lens functionality within Chrome's renderer. When a crafted HTML page is loaded, the browser fails to adequately validate or sanitize the input data before processing it through the lens engine, creating a pathway for privilege escalation. This flaw operates at the intersection of multiple security boundaries where the renderer process should be isolated from system-level operations but can be manipulated to execute code outside its designated sandbox. The vulnerability's low chromium security severity rating belies its potential impact as it represents a sandbox escape vector that could enable attackers to bypass fundamental browser security mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation, potentially allowing attackers to access sensitive user data, modify system files, or establish persistent backdoors on the affected machine. The attack requires an initial compromise of the renderer process, which is often achieved through social engineering attacks, drive-by downloads, or exploitation of other browser vulnerabilities. Once inside the renderer, the attacker can craft a malicious HTML page that triggers the vulnerable code path in Google Lens, effectively breaking out of the sandbox and gaining access to system resources that should remain protected. This vulnerability particularly affects users who frequently interact with web content that may contain malicious payloads.
Mitigation strategies for this vulnerability involve immediate patching of Chrome browsers to version 151.0.7922.72 or later, which contains the necessary fixes to prevent input validation bypasses in Google Lens functionality. System administrators should implement comprehensive browser update policies and consider deploying additional security layers such as exploit protection software and web application firewalls. The vulnerability aligns with attack patterns described in the mitre ATT&CK framework under techniques related to privilege escalation and sandbox evasion, specifically targeting the T1055 category for privilege escalation through exploitation of software vulnerabilities. Organizations should also implement monitoring for suspicious browser activity and maintain up-to-date threat intelligence feeds to detect potential exploitation attempts.
This vulnerability demonstrates the ongoing challenges in maintaining secure browser environments where multiple security layers must work together to prevent attackers from escalating privileges. The weakness reflects a common pattern in modern browsers where complex features like image recognition and lens-based processing require extensive input validation that may not be adequately implemented. Security researchers should continue monitoring for similar issues in other browser components and ensure that all user-generated content processing pathways include robust input validation and sanitization measures. The incident highlights the importance of maintaining secure coding practices and regular security audits to identify potential sandbox escape vectors before they can be exploited by malicious actors in the wild.