CVE-2026-113086 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in Input 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: Medium)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within Google Chrome, specifically in versions prior to 156.0.8078.47, represents a significant risk to user safety and system integrity. This issue stems from insufficient sanitization or boundary checking of data inputs processed by the browser engine during the parsing of HTML content. When a remote attacker crafts a malicious webpage containing specially constructed input fields or script elements, they can exploit this lack of validation to bypass security controls embedded within the Chromium architecture. The severity is classified as medium by the Chromium team, indicating that while exploitation requires specific conditions such as user interaction with a crafted page, the potential consequences are severe due to the nature of code execution capabilities involved.
At its core, this vulnerability falls under the category of CWE-20: Improper Input Validation, which describes situations where software receives input from an upstream component but does not properly validate that it meets expected format or range requirements. In the context of a web browser like Chrome, inputs are often processed through complex rendering engines and JavaScript interpreters before being executed in isolated sandbox environments. When validation is lax, attackers can inject malformed data structures that confuse these components, leading to memory corruption states such as buffer overflows or use-after-free conditions. These low-level memory errors serve as the foundational mechanism for escalating privileges from a restricted browser context into one where arbitrary code execution becomes possible.
The operational impact of this vulnerability extends beyond simple script injection because it allows for potential escape from the Chrome sandbox, which is designed to limit the damage caused by compromised web content. If an attacker successfully exploits this flaw via a crafted HTML page hosted on a malicious website or delivered through phishing campaigns, they may achieve arbitrary code execution within the browser process context. This capability enables further attacks such as stealing sensitive cookies and session tokens, installing malware payloads, or pivoting to attack other applications running on the host system if sandbox boundaries are breached. The ability to execute code remotely makes this a high-value target for automated exploit kits that scan for vulnerable browser versions across large networks.
To mitigate these risks, organizations must ensure that all instances of Google Chrome and Chromium-based browsers are updated to version 156.0.8078.47 or later immediately upon availability. Patch management systems should be configured to prioritize security updates from major software vendors to minimize the window of exposure. Additionally, users can reduce their attack surface by disabling JavaScript on untrusted sites using browser extensions or enterprise policies, although this may impact usability for legitimate web applications. Implementing content security policies and leveraging advanced threat protection features provided by endpoint detection and response solutions can also help detect anomalous behavior resulting from such exploitation attempts before full compromise occurs.
From a defensive perspective, understanding the mapping to industry standards aids in prioritizing remediation efforts. This vulnerability aligns with MITRE ATT&CK technique T1059: Command and Scripting Interpreter, as it facilitates the execution of arbitrary commands within the browser environment. It also relates to T1204: User Execution, since successful exploitation typically requires a user to visit or interact with the malicious HTML page. Security teams should monitor for indicators of compromise associated with drive-by download attacks and ensure that network perimeter defenses block access to known malicious domains hosting such crafted pages. Regular vulnerability scanning against browser versions remains critical in maintaining a robust security posture against evolving web-based threats.