CVE-2026-113110 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in ShadowDOM in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as a memory corruption issue within the ShadowDOM implementation of Google Chrome prior to version 156.0.8078.47 represents a significant breach in browser isolation mechanisms. Shadow DOM is a web standard that allows for encapsulation of HTML and CSS, creating separate document trees that are hidden from the main page's script access. This feature is critical for building reusable components and maintaining style scoping in modern web applications. However, flaws in how Chrome manages memory allocation and deallocation during the manipulation of these shadow roots can lead to heap corruption. When a remote attacker crafts an HTML page specifically designed to exploit this flaw, they can trigger undefined behavior within the browser's rendering engine or JavaScript V8 engine. The core technical failure lies in improper handling of object lifecycles or boundary checks when interacting with shadow tree nodes, resulting in writes to invalid memory addresses or use-after-free conditions that compromise the integrity of the heap structure.
The operational impact of this vulnerability is severe due to its potential for remote code execution within a sandboxed environment. Although Chrome employs multiple layers of security such as site isolation and process separation, successful exploitation allows an attacker to bypass these controls by corrupting memory structures in a way that grants arbitrary read or write capabilities. This capability enables the injection and execution of malicious payloads directly inside the browser's context. An attacker could leverage this access to steal sensitive user data, including cookies, session tokens, and credentials stored within the browser profile. Furthermore, because the code executes with the privileges of the compromised process, it can serve as a foothold for further lateral movement or escalation if additional vulnerabilities are present in other components running under similar permissions. The medium severity rating assigned by Chromium reflects that while exploitation requires specific conditions such as user interaction to load the crafted page, the resulting impact is high due to the potential for full system compromise depending on subsequent exploit chain steps.
From a classification perspective, this vulnerability aligns with CWE-120 Buffer Overflow and potentially CWE-416 Use After Free, which are common categories of memory corruption flaws in complex software systems like web browsers. In terms of adversary tactics, exploitation would likely fall under the MITRE ATT&CK technique T1059 Command and Scripting Interpreter or T1203 Exploitation for Client Execution, as it involves leveraging a client-side application to run arbitrary code initiated by an external actor. The attack vector is classified as remote via network (ATT&CK TA0001 Initial Access), specifically through the delivery of malicious web content that triggers the vulnerability upon rendering or script execution within the browser environment.
Mitigation strategies primarily involve immediate patching to version 156.0.8078.47 or later, where Google has addressed the underlying memory management errors in Shadow DOM handling. Organizations should enforce automatic update policies for all endpoints running Chrome to ensure timely application of security patches. For users unable to upgrade immediately, enabling Safe Browsing features and restricting script execution on untrusted domains can reduce exposure. Additionally, deploying browser isolation solutions or sandboxing technologies at the network level can limit the impact if a vulnerability is successfully exploited by containing the malicious process within an isolated environment that cannot communicate with critical system resources. Regular security awareness training for users to avoid clicking suspicious links remains a vital defense-in-depth measure against social engineering tactics often used in conjunction with such technical exploits.