CVE-2026-113020 in Chrome
Summary
by MITRE • 10/21/2026
Improper input validation in Date in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified as an improper input validation flaw within the Date handling mechanisms of Google Chrome prior to version 156.0.8078.47 represents a significant breach in browser security boundaries. This issue stems from insufficient sanitization and type checking when processing date-related inputs, which are commonly encountered during web page rendering or script execution. The core technical flaw lies in the failure of the JavaScript engine to properly validate the format, range, or structure of date strings before passing them to underlying C++ components responsible for time calculations and formatting. This lack of rigorous input validation allows a crafted HTML page containing maliciously constructed date objects or string manipulations to trigger undefined behavior within the browser's core libraries. Such conditions can lead to memory corruption issues, including buffer overflows or use-after-free scenarios, which are critical prerequisites for achieving arbitrary code execution.
From an operational perspective, this vulnerability enables a remote attacker to execute arbitrary code outside the sandbox environment that typically isolates web content from the host operating system. The Chromium security severity is classified as High because successful exploitation grants the attacker control over the browser process with elevated privileges relative to standard web page restrictions. An attack scenario would involve tricking a user into visiting a specially crafted webpage or opening an email attachment containing malicious HTML. Upon loading, the script within the page exploits the date parsing logic to corrupt memory structures in the renderer process. If the sandbox boundaries are bypassed through this exploitation chain, the attacker can execute native code on the victim's machine, potentially leading to full system compromise, data exfiltration, or installation of persistent malware.
This vulnerability aligns with CWE-20 Improper Input Validation and CWE-119 Memory Corruption based on improper buffer operations, as it involves failing to restrict inputs that could lead to memory safety violations. In the context of the MITRE ATT&CK framework, this exploit technique maps to T1203 Exploitation for Client Execution, where adversaries leverage vulnerabilities in client software like web browsers to execute malicious payloads without user interaction beyond initial visitation. The attack vector is classified as Network-based with High complexity due to the need for specific crafted inputs and potentially social engineering elements to trigger the vulnerability.
Mitigation strategies primarily involve updating Google Chrome to version 156.0.8078.47 or later, where these input validation checks have been strengthened. Developers should ensure that all date parsing functions enforce strict type checking and range verification before processing data in native code layers. Additionally, defense-in-depth measures such as enabling Site Isolation can help limit the blast radius of any successful exploitation by ensuring that renderer processes are isolated from each other and from sensitive browser components. Regular patching cycles and monitoring for anomalous behavior in web content execution remain essential practices to mitigate risks associated with zero-day or recently disclosed vulnerabilities like this one.