CVE-2026-113330 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in CustomTabs in Google Chrome on on Android 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 involves a memory corruption flaw within the CustomTabs component of Google Chrome for Android, specifically affecting versions prior to 156.0.8078.47. This issue arises from improper handling of memory operations during the processing of web content rendered through custom tabs, which are designed to allow applications to display web pages without leaving the host app context. The flaw is classified under CWE-122, Heap-based Buffer Overflow, indicating that the application writes data beyond the boundaries of a allocated heap buffer due to insufficient validation of input lengths or indices. This type of memory corruption typically occurs when an attacker provides crafted HTML content that triggers an out-of-bounds write operation within the browser engine's rendering pipeline.
From a technical perspective, the exploitation vector relies on delivering maliciously constructed HTML via a remote server. When a user interacts with a link opening in CustomTabs or is redirected to such content, the browser parses the input and attempts to render it. Due to the logic error in memory management, specific sequences of data cause the application to overwrite adjacent memory structures. This corruption can alter control flow data, such as function pointers or return addresses stored on the heap, thereby allowing an attacker to gain arbitrary code execution capabilities within the Chrome sandbox environment. The Chromium security severity is rated as Low because the exploit complexity may be high and successful exploitation often requires specific user interaction conditions, yet the potential impact remains significant due to the privileged nature of browser processes relative to other app sandboxes.
The operational impact of this vulnerability centers on the potential for remote code execution within a restricted sandbox. While Chrome employs multiple layers of defense including site isolation, seccomp-bpf filters, and pointer authentication, bypassing these controls through memory corruption remains a primary attack vector in modern browsers. Successful exploitation could allow an attacker to escape the browser's security boundary, potentially leading to further system compromise depending on the privileges granted to the browser process by the Android operating system. This aligns with ATT&CK technique T1203, Exploitation for Client Execution, where adversaries use vulnerabilities in client software to execute malicious code on a victim's device without direct installation of malware payloads.
Mitigation strategies primarily involve immediate patching to version 156.0.8078.47 or later, which addresses the underlying memory management errors through rigorous bounds checking and improved input validation within the CustomTabs implementation. Security administrators should ensure that all Android devices running Chrome are updated promptly via official distribution channels. Additionally, users can reduce risk by disabling unnecessary custom tab integrations in third-party applications if possible, although this is often not feasible for standard usage patterns. Defense-in-depth measures such as enabling Safe Browsing and keeping the operating system up to date provide additional layers of protection against exploitation attempts targeting browser vulnerabilities.