CVE-2026-113244 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in UI 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: Low)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within the user interface of Google Chrome prior to version 156.0.8078.47 represents a significant breach in the browser's defense-in-depth architecture. This specific defect allows for potential arbitrary code execution inside the sandbox, which is contrary to the expected security posture where untrusted content should be strictly isolated from system resources. The root cause lies in how the rendering engine processes user-supplied data within HTML pages that are crafted specifically to exploit this logic error. When a victim visits such a malicious webpage, the browser fails to adequately sanitize or validate specific inputs before passing them to internal components responsible for memory management and execution context switching. This oversight enables an attacker to manipulate the state of the application in ways that bypass standard security checks, leading to the escalation of privileges from the restricted sandbox environment to a higher level where arbitrary code can be executed with the permissions of the browser process.
From a technical perspective, this vulnerability aligns closely with CWE-20 Improper Input Validation and potentially CWE-787 Out-of-bounds Write if memory corruption is involved in the exploitation chain. The attack vector is classified as remote via network (ATT&CK T1189), requiring no user interaction beyond visiting a maliciously constructed website, which significantly increases its risk profile despite the Chromium security severity being rated as Low. The low rating likely reflects the difficulty of reliable exploitation or the limited scope of impact in typical scenarios, but it does not diminish the critical nature of bypassing sandbox isolation. Sandbox escapes are among the most severe browser vulnerabilities because they effectively neutralize one of the primary mechanisms protecting users from malicious web content. By executing code inside the sandbox with elevated privileges, an attacker can potentially access sensitive user data, install persistent malware, or pivot to attack other systems on the local network if further lateral movement is possible through subsequent exploits.
The operational impact of this vulnerability extends beyond immediate code execution. It undermines trust in the browser's ability to isolate web content from the host operating system. In enterprise environments where Chrome is used for secure browsing sessions involving sensitive corporate data, such a flaw could lead to unauthorized access to confidential information stored locally or accessible via local APIs. Furthermore, because the exploit relies on crafted HTML pages, it can be delivered through various social engineering tactics including phishing emails with malicious links or compromised legitimate websites that serve adware containing the exploit code. The persistence of this vulnerability in versions prior to 156.0.8078.47 indicates a gap in the patching cycle for certain deployment channels, leaving users on older builds exposed until they update their software.
Mitigation strategies must prioritize immediate version updates as the primary defense vector. Organizations should enforce automated update policies to ensure all endpoints are running Chrome 156.0.8078.47 or later, which contains the fix for this input validation logic error. In addition to patching, implementing application control solutions can help prevent the execution of unauthorized scripts and binaries that might be deployed following a successful sandbox escape. Network-level defenses such as web filtering proxies should also be configured to block access to known malicious domains hosting exploit kits or suspicious HTML content patterns associated with this vulnerability type. Regular security awareness training for users remains essential, even though the attack is automated via crafted pages, as user vigilance against phishing attempts reduces the overall surface area of exposure. Continuous monitoring for anomalous browser behavior and memory usage spikes can also aid in detecting potential exploitation attempts in real-time before full compromise occurs.