CVE-2026-113279 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Accessibility 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: Critical)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified involves a critical memory corruption flaw within the Accessibility subsystem of Google Chrome, specifically affecting versions prior to 156.0.8078.47. This defect resides in the component responsible for managing accessibility features such as screen readers and other assistive technologies that interact with web content. The core technical issue stems from improper handling of memory operations during the processing of crafted HTML pages, which likely involves a use-after-free or buffer overflow condition within the internal data structures used to represent accessibility nodes. When an attacker constructs a malicious webpage designed to trigger this specific code path, they can manipulate these memory regions in ways that violate Chrome's sandboxing boundaries. The severity is classified as Critical by Chromium security standards because it allows for arbitrary code execution with high reliability under typical browsing conditions.
From an operational perspective, the impact of this vulnerability extends beyond simple data exposure or denial of service. Because the flaw permits remote attackers to execute arbitrary code inside the browser process sandbox, it represents a significant escalation path from initial compromise to full system control if additional vulnerabilities are chained together. The attacker can inject and run malicious payloads that operate with the privileges of the current user within the restricted environment of the renderer process. This capability undermines the fundamental security model of Chrome, which relies on strict isolation between web content and the operating system. Successful exploitation could lead to the installation of malware, theft of sensitive credentials stored in the browser, or use of the compromised machine as part of a botnet. The requirement for user interaction is typically limited to visiting a malicious website or clicking a link that loads such a page, making this attack vector highly effective against unsuspecting users who may not recognize the threat embedded within standard web content.
This vulnerability aligns with Common Weakness Enumeration category CWE-120, which describes buffer copy without checking size limits, and potentially CWE-416 for use after free if the corruption arises from accessing freed memory. In terms of offensive security frameworks, this exploit technique maps to MITRE ATT&CK tactic T1059, specifically command and script interpretation within a sandboxed environment, as well as T1203 for exploitation of client software. The attack vector is classified as Remote (Network) with High complexity in some contexts due to the need for specific crafted inputs, but the critical severity rating reflects the ease with which modern exploit kits can automate this process once the initial trigger condition is met.
Mitigation strategies primarily involve immediate patching through updating Google Chrome to version 156.0.8078.47 or later where these memory management issues have been resolved by developers who implemented stricter bounds checking and improved lifecycle management for accessibility objects. For organizations unable to update immediately, network-level controls such as web filtering proxies can be configured to block access to known malicious domains hosting exploit kits that target this specific vulnerability. Additionally, enabling Chrome's Site Isolation feature ensures that even if an attacker exploits the memory corruption in one tab, they cannot easily escape the sandbox to affect other tabs or system resources. Security awareness training should also emphasize caution when visiting untrusted websites, as social engineering remains a common precursor to triggering such technical vulnerabilities. Regular monitoring of browser update notifications and automated patch management systems are essential to maintaining defense against these rapidly evolving web-based threats.