CVE-2026-17837 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in DevTools 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: Medium)
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical sandbox escape risk within Google Chrome's DevTools implementation that could be exploited by attackers who have already compromised the renderer process. The flaw stems from inadequate validation of untrusted input within the DevTools component, creating a pathway for privilege escalation attacks. When an attacker successfully compromises the renderer process through other means, they can craft malicious HTML content that exploits this input validation weakness to break out of the sandboxed environment and gain elevated privileges on the system.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and specifically relates to sandbox escape techniques that bypass operating system security mechanisms. The Chromium security severity classification of Medium reflects the complexity required to exploit this vulnerability, as it requires prior compromise of the renderer process before the attack can be executed. This makes the vulnerability particularly dangerous in targeted attacks where attackers have already established a foothold in the browser environment.
The operational impact of this vulnerability extends beyond simple privilege escalation, as successful exploitation could allow attackers to access sensitive user data, execute arbitrary code with system-level privileges, and potentially establish persistent backdoors. The sandbox escape capability means that even if users have security measures in place to isolate browser processes, this vulnerability undermines those protections by enabling attackers to move laterally from the compromised renderer process into the broader operating system environment.
Organizations should prioritize immediate patching of Chrome versions prior to 151.0.7922.72 and implement additional monitoring for suspicious DevTools activity. Network defenders should consider implementing process isolation controls and monitoring for unusual DevTools API usage patterns, particularly when these APIs are accessed from compromised browser contexts. The vulnerability also highlights the importance of maintaining up-to-date browser security patches and implementing layered defense strategies that reduce the attack surface available to adversaries who may have achieved initial access through other means.
From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and sandbox evasion, specifically targeting the T1059.007 (Command and Scripting Interpreter: JavaScript) and T1497.001 (Virtualization/Sandbox Evasion: System Checks) tactics. The exploitation pathway demonstrates how attackers can leverage browser-based vulnerabilities to bypass security controls that are designed to contain malicious activities within specific process boundaries, making this a particularly concerning weakness in modern browser security architectures where sandboxing is a fundamental defense mechanism.