CVE-2026-95334 in Chrome
Summary
by MITRE • 09/29/2026
Incorrect reference resolution in WebProtect in Google Chrome prior to 154.0.8037.57 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as an incorrect reference resolution within Google Chrome's WebProtect component prior to version 154.0.8037.57 represents a critical failure in boundary enforcement between the browser’s sandboxed renderer processes and higher-privilege system components. This flaw specifically impacts the integrity of the security model that isolates web content from the underlying operating system, allowing for potential privilege escalation under specific conditions. The core technical issue stems from how WebProtect handles object references during runtime operations. When a crafted HTML page is processed by the browser engine, it triggers a sequence where an internal reference is resolved incorrectly. This misresolution allows data or control flow to bypass expected security checks that are designed to restrict actions within the renderer process sandbox.
From a technical perspective, this vulnerability aligns with CWE-20 Improper Input Validation and potentially CWE-754 Incorrect Check for Unusual or Exceptional Conditions. The attacker leverages a crafted HTML page containing specific malicious code structures that exploit the logic error in reference resolution. By manipulating these references, the attacker can trick the WebProtect module into executing commands or accessing resources outside its designated scope. This is not merely an information leak but a mechanism for arbitrary code execution, which fundamentally breaks the isolation guarantees provided by Chrome’s multi-process architecture. The severity of this flaw is classified as low in Chromium security metrics because it requires a pre-condition: the renderer process must already be compromised. However, even with this constraint, the ability to escape the sandbox poses significant risks if an attacker can achieve initial compromise through other vectors such as phishing or drive-by downloads.
The operational impact of this vulnerability centers on the potential for lateral movement and deeper system infiltration within a victim’s environment. If an attacker successfully exploits this flaw, they gain the ability to execute arbitrary code with higher privileges than those granted to standard web content. This effectively neutralizes one of Chrome's primary defense layers against malware injection and data exfiltration. The attack scenario typically involves social engineering or malicious advertising networks delivering the crafted HTML page. Once loaded in a tab where renderer isolation is active, the exploit attempts to resolve references in a way that escapes the sandbox boundary. Success allows the attacker to interact with local files, install persistent backdoors, or pivot to other systems on the network if additional vulnerabilities are present.
Mitigation strategies primarily involve immediate software updates and strict access controls. Users must upgrade Google Chrome to version 154.0.8037.57 or later where this reference resolution logic has been corrected. Until patching is applied, organizations should enforce strict content security policies that restrict the execution of inline scripts and untrusted HTML fragments within browser contexts. Additionally, deploying endpoint detection and response solutions can help identify anomalous process creation events originating from Chrome renderer processes, which may indicate an active exploitation attempt. Security teams should also monitor for unusual network connections initiated by browser sub-processes as a heuristic indicator of compromise related to sandbox escape attempts.
This incident highlights the importance of maintaining robust input validation within security-critical components like WebProtect. The ATT&CK framework categorizes such techniques under T1059 Command and Scripting Interpreter, specifically when used for privilege escalation via sandbox escapes. Continuous monitoring and rapid patch management are essential defenses against these types of logic-based vulnerabilities that rely on subtle implementation errors rather than obvious buffer overflows or memory corruption issues.