CVE-2026-113175 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in FileSystem 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: High)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper input validation flaw within the FileSystem component of Google Chrome prior to version 156.0.8078.47 represents a critical breach in the browser's defense-in-depth architecture. This specific defect allows for arbitrary code execution inside the sandbox, which is particularly severe because it circumvents one of the primary security mechanisms designed to contain malicious activities within web pages. The FileSystem API serves as an interface that enables websites to access and manipulate files on the user’s local storage in a controlled manner. When input validation fails at this layer, attackers can craft HTML pages containing specially constructed scripts or payloads that exploit parsing inconsistencies or boundary errors. These crafted inputs bypass expected constraints, leading to memory corruption or logic flaws that permit the execution of arbitrary commands with the privileges granted to the browser process rather than being restricted to a lower-privilege sandboxed environment.
From a technical perspective, this flaw aligns closely with CWE-20 Improper Input Validation and potentially CWE-119 Memory Corruption based on the nature of code execution vulnerabilities in complex software systems like browsers. The attacker’s ability to execute arbitrary code inside the sandbox indicates that the validation logic failed to properly sanitize or verify user-supplied data before it was processed by critical system components. This often involves manipulating file paths, metadata structures, or API parameters in ways that trigger undefined behavior within the underlying C++ codebase of Chromium. Such exploitation typically results in heap overflow, use-after-free conditions, or type confusion errors, which are then leveraged to gain control over instruction pointers and execute malicious shellcode. The severity is rated as High by the Chromium security team due to the direct impact on system integrity and the potential for full compromise if sandbox escape techniques are subsequently applied.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, although those remain significant risks. Successful exploitation allows a remote attacker to run arbitrary code with the same privileges as the browser process itself. This means that an infected webpage could install persistent malware, exfiltrate sensitive documents stored locally by the user, keylog inputs across other applications if privilege escalation occurs, or use the compromised machine as part of a botnet. Because modern browsers rely heavily on sandboxing to limit the blast radius of web-based attacks, breaking out of this containment is a major security failure. It effectively neutralizes the protective barriers intended to isolate untrusted content from trusted system resources, thereby exposing the entire operating environment to potential compromise through a single visit to a malicious site or via drive-by download techniques embedded in legitimate but compromised websites.
Mitigation strategies primarily involve immediate software updates and rigorous patch management protocols. Users must upgrade Google Chrome to version 156.0.8078.47 or later, where the input validation logic within the FileSystem component has been corrected to properly handle edge cases and reject malformed inputs before they reach critical processing stages. For enterprise environments, deploying browser policies that restrict access to certain APIs can provide an additional layer of defense against exploitation attempts while updates are being propagated across endpoints. Security teams should also monitor for indicators of compromise associated with drive-by downloads targeting this specific vulnerability class. Furthermore, enabling automatic update mechanisms ensures that users receive security patches promptly as they become available, reducing the window of exposure. Regular audits of third-party extensions and plugins are also recommended, as these can sometimes introduce similar validation weaknesses if not maintained according to current best practices aligned with ATT&CK techniques related to initial access and execution via web browsers.