CVE-2026-113271 in Chrome
Summary
by MITRE • 10/21/2026
Use after free in Accessibility 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: Critical)
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified as a use-after-free error within the Accessibility component of Google Chrome prior to version 156.0.8078.47 represents a critical memory corruption flaw that undermines the browser's core security model. This specific defect occurs when the application continues to reference a memory block after it has been freed, leading to undefined behavior during runtime operations related to accessibility features such as screen readers or assistive technologies. The root cause lies in improper management of object lifecycles within the Chromium rendering engine, where pointers are not properly nullified or invalidated upon deallocation, allowing an attacker to manipulate these dangling references for malicious purposes.
From a technical perspective, this flaw enables arbitrary code execution inside the browser's sandbox environment, which is designed to isolate web content from the host operating system and restrict potential damage from compromised pages. By crafting a specific HTML page that triggers the premature freeing of accessibility-related objects while maintaining active references through JavaScript or DOM manipulation, an attacker can achieve heap corruption. This corruption allows for precise control over memory layout, facilitating the exploitation of other vulnerabilities such as type confusion or out-of-bounds writes to bypass sandbox restrictions and execute arbitrary commands with the privileges of the browser process.
The operational impact of this vulnerability is severe due to its remote exploitability via a crafted web page. Users visiting malicious sites can trigger the flaw without any additional interaction, leading to full system compromise if the attacker successfully escapes the sandbox. This aligns with Common Weakness Enumeration (CWE) category CWE-416, which describes use-after-free conditions that lead to memory corruption and potential code execution. Furthermore, in the context of the MITRE ATT&CK framework, this vulnerability supports techniques associated with initial access through drive-by compromise and privilege escalation via sandbox escape, specifically mapping to tactics such as Execution and Defense Evasion where attackers leverage browser vulnerabilities to establish persistence or move laterally within a networked environment.
Mitigation strategies primarily involve immediate patching of the Google Chrome installation to version 156.0.8078.47 or higher, which includes fixes for memory management logic in the accessibility subsystem. Organizations should enforce automated update policies to ensure all endpoints are protected against known browser vulnerabilities. Additionally, deploying advanced endpoint detection and response solutions can help identify anomalous behavior indicative of exploitation attempts, such as unusual process creation following web browsing activity. Security teams must also remain vigilant regarding emerging exploits targeting similar memory corruption flaws in other components of the Chromium engine, maintaining a robust defense-in-depth posture that includes network segmentation and application whitelisting to limit the blast radius of potential compromises.