CVE-2026-113294 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in Loader in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within the Loader component of Google Chrome prior to version 156.0.8078.47 represents a significant breach in the browser's defense-in-depth strategy. This specific weakness allows for potential arbitrary code execution inside the sandbox, which is contrary to the intended isolation model that protects the host system from malicious web content. The issue stems from insufficient checks performed by the Loader when processing input data associated with crafted HTML pages. In modern browsers like Chrome, the renderer process operates within a strict sandbox environment designed to limit the privileges of code executed in response to user interactions or remote content delivery. By bypassing these validation mechanisms, an attacker can manipulate internal state variables or memory structures that are not adequately protected by standard boundary checks.
From a technical perspective, improper input validation often leads to conditions such as buffer overflows, type confusion, or logic errors that allow for out-of-bounds reads and writes. In the context of Chrome's architecture, if the Loader fails to correctly validate the structure, size, or content types of incoming data before passing it to lower-level components, an attacker can craft a malicious HTML page containing specially designed scripts or embedded objects. When this page is rendered by a victim user, the malformed input triggers the vulnerability during the loading phase. This exploitation path enables the execution of arbitrary commands within the sandboxed renderer process. While the sandbox provides substantial protection against full system compromise, achieving code execution inside it can still lead to further privilege escalation attacks or data exfiltration if additional vulnerabilities are chained together.
The operational impact of this vulnerability is classified as low severity by Chromium security standards, yet its implications remain serious for targeted attacks. An attacker could distribute the crafted HTML page via phishing emails, compromised websites, or drive-by download scenarios. If a user visits such a site while using an affected version of Chrome, the browser may execute arbitrary code without explicit consent. Although sandbox escape is not guaranteed by this single flaw alone, it provides a critical foothold for attackers aiming to bypass security boundaries. The ability to run code inside the renderer increases the attack surface significantly, as subsequent exploits can leverage other weaknesses in the operating system or browser components to achieve higher privileges. This aligns with common exploitation patterns observed in advanced persistent threats where initial access is gained through web-based vectors before moving laterally within a network environment.
This vulnerability maps directly to CWE-20 Improper Input Validation and falls under the ATT&CK technique of Initial Access via Spearphishing Link or Drive-by Compromise, specifically leveraging browser vulnerabilities for code execution. It also relates to Defense Evasion techniques involving sandbox escape attempts, although in this case, the primary achievement is gaining foothold within the renderer process rather than escaping it entirely. The lack of rigorous input sanitization highlights a gap in the security controls that are supposed to filter untrusted data before processing. Such gaps are often exploited by automated exploit kits or sophisticated threat actors who maintain libraries of browser-specific payloads designed to trigger these specific logic errors during page load events.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 156.0.8078.47 or later immediately upon availability. Patch management processes should be optimized to reduce the window of exposure for known vulnerabilities in widely used software components like web browsers. Additionally, implementing application whitelisting can help prevent unauthorized code execution even if a vulnerability is exploited. Users should also exercise caution when visiting unfamiliar websites and consider using browser extensions that block potentially malicious scripts or restrict permissions for untrusted domains. Security teams should monitor network traffic for indicators of compromise associated with known exploit kits targeting Chrome vulnerabilities and ensure that endpoint detection systems are configured to alert on suspicious process creation events originating from the renderer processes. Regular security assessments and penetration testing can further identify similar input validation weaknesses in custom web applications deployed within corporate environments, reducing the overall attack surface against such browser-based exploits.