CVE-2026-95381 in Chrome
Summary
by MITRE • 09/29/2026
Improper input validation in Printing 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: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an improper input validation flaw within Google Chrome's printing subsystem represents a significant breach in browser isolation mechanisms, specifically affecting versions prior to 154.0.8037.57. This defect allows for the potential execution of arbitrary code outside the security sandbox when triggered by a remote attacker who has already compromised the renderer process. The core issue lies in the insufficient sanitization and validation of data passed from untrusted web content into privileged printing components, which operate with higher system privileges than standard rendering contexts.
From a technical perspective, this vulnerability is classified under CWE-20 Improper Input Validation within the Common Weakness Enumeration framework. The flaw typically manifests when user-controlled input, such as specific HTML structures or JavaScript objects designed to manipulate print jobs, bypasses expected boundary checks. In modern browsers like Chrome, the renderer process runs in a sandboxed environment with restricted access to system resources and file paths. However, certain operations, particularly those involving printing, require interaction with native operating system APIs and higher-privilege processes to handle document rendering pipelines, font management, and printer driver communication. When input validation is lax, an attacker can craft malicious HTML or JavaScript that exploits these privileged pathways, effectively escaping the sandbox boundaries.
The operational impact of this vulnerability is severe due to its potential for privilege escalation via process isolation bypass. Although the initial vector requires a compromised renderer process, which often results from other vulnerabilities such as cross-site scripting (XSS) or remote code execution in extensions, the ability to escape the sandbox transforms a contained breach into full system compromise. An attacker leveraging this flaw could execute arbitrary commands with the privileges of the browser's higher-privilege processes, potentially leading to data exfiltration, installation of persistent malware, or further lateral movement within a networked environment. This aligns with MITRE ATT&CK technique T1055 Process Injection and T1218 Signed Binary Proxy Execution if the exploit involves hijacking legitimate system binaries during the print operation.
Mitigation strategies primarily involve applying the vendor-provided security patches that address this specific input validation gap in Chrome version 154.0.8037.57 or later. Organizations should ensure automated update mechanisms are enabled to maintain browser currency, as zero-day exploits targeting such sandbox escapes are frequently weaponized by advanced persistent threats. Additionally, implementing strict Content Security Policy (CSP) headers can reduce the attack surface for initial renderer compromise, thereby limiting the likelihood of an attacker reaching this specific vulnerability chain. Regular security audits focusing on input handling in privileged components and minimizing the use of legacy printing APIs where possible further harden the environment against such exploitation attempts.