CVE-2026-110916 in Chrome
Summary
by MITRE • 10/16/2026
Improper input validation in Desktop in Google Chrome prior to 155.0.8059.84 allowed a remote attacker 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 • 10/16/2026
The vulnerability identified as an improper input validation flaw within the Desktop component of Google Chrome prior to version 155.0.8059.84 represents a significant breach in browser security boundaries. This issue stems from insufficient sanitization or type-checking mechanisms when processing user-supplied data, specifically through crafted HTML pages delivered by remote attackers. In modern web browsers like Chrome, the renderer process operates within a strict sandbox to limit the potential damage of any successful exploitation attempt. However, this specific flaw allows an attacker to bypass these containment measures, effectively escaping the sandbox environment and gaining execution capabilities outside its protective boundaries.
From a technical perspective, improper input validation often involves failing to correctly interpret or restrict special characters, object types, or memory structures passed through web APIs or JavaScript engines. When a browser processes HTML content that contains maliciously crafted elements, it may perform operations on untrusted data without verifying the integrity or expected format of that data. In this instance, the flaw likely resides in how Chrome handles specific DOM properties or scripting contexts where type confusion or buffer manipulation can occur. By exploiting these validation gaps, an attacker can trigger undefined behavior within the browser's core components, leading to arbitrary code execution with higher privileges than those granted by the sandboxed renderer process.
The operational impact of this vulnerability is severe due to its remote exploitability and potential for privilege escalation. A successful attack requires only that a victim visits a malicious website or clicks on a specially crafted link containing the exploitable HTML content. Once triggered, the attacker can execute arbitrary code on the user's system with the privileges of the current user account. This level of access allows for comprehensive compromise of the target machine, including theft of sensitive data such as credentials, cookies, and personal information, installation of persistent malware, or use of the device in a botnet. The medium severity rating assigned by Chromium reflects the complexity required to exploit this flaw reliably across different environments, yet it remains dangerous due to its direct path to code execution without requiring additional user interaction beyond visiting the page.
This vulnerability aligns with Common Weakness Enumeration category CWE-20 Improper Input Validation and is closely related to CWE-94 Code Injection where untrusted data controls program flow or logic. In terms of offensive security frameworks, this exploit technique maps to MITRE ATT&CK tactics involving Initial Access via Spearphishing Link or Drive-by Compromise, followed by Execution through Command and Scripting Interpreter within the context of browser-based attacks. The escape from sandbox boundaries also relates to techniques found in lateral movement or privilege escalation phases if further exploitation is possible post-compromise.
Mitigation strategies primarily involve immediate software updates. Administrators and users must upgrade Google Chrome to version 155.0.8059.84 or later, where the input validation logic has been corrected to properly sanitize inputs and enforce strict type checking before processing. Until patches are applied, organizations should consider implementing network-level controls such as web filtering proxies that block access to known malicious domains or restrict execution of active content from untrusted sources. Additionally, enabling sandboxing features strictly and disabling unnecessary browser plugins can reduce the attack surface. Security awareness training for end-users remains critical to prevent them from interacting with suspicious links or downloading unexpected files that could trigger this vulnerability through social engineering tactics.