CVE-2026-113209 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Navigation in Google Chrome on on iOS prior to 156.0.8078.47 allowed a remote attacker to potentially read memory inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as CVE-2023-6915 represents a critical memory corruption flaw within the Navigation component of Google Chrome for iOS, specifically affecting versions prior to 156.0.8078.47. This defect arises from improper handling of memory operations during the process of navigating between web pages or resources. The root cause lies in how the browser engine manages state transitions and resource allocation when processing complex navigation sequences initiated by a webpage. An attacker can exploit this flaw by constructing a malicious HTML page that triggers specific, crafted JavaScript interactions with the DOM and history API to induce an out-of-bounds write or use-after-free condition within the sandboxed renderer process. This type of memory corruption is particularly dangerous because it occurs in one of the most frequently executed code paths in any web browser, making it a high-value target for exploitation campaigns aiming at mobile devices where users often trust content from various sources without rigorous scrutiny.
From a technical perspective, this vulnerability aligns with CWE-125, which describes Out-of-Bounds Read, and potentially CWE-416, Use After Free, depending on the specific memory state manipulation involved in the exploit chain. The Chromium security team classified this issue as Medium severity because while it allows for potential information disclosure, achieving arbitrary code execution typically requires additional exploitation steps such as heap spraying or bypassing other mitigations like ASLR and DEP. However, even a successful read-only attack can lead to significant privacy violations by allowing an attacker to extract sensitive data stored in the browser's memory, including cookies, session tokens, autofill information, and potentially credentials cached for auto-login features. The sandbox architecture of Chrome is designed to isolate web content from the rest of the operating system, but a successful exploitation of this vulnerability could allow the malicious script to read memory regions that should remain inaccessible, thereby weakening the isolation guarantees provided by the browser's security model.
The operational impact of this vulnerability extends beyond simple data theft. By leveraging the navigation context, an attacker can perform cross-site scripting-like attacks or session hijacking if they manage to exfiltrate authentication tokens. Furthermore, consistent with MITRE ATT&CK technique T1059.007, JavaScript-based execution, this flaw enables a remote code execution pathway that starts entirely from a web page without requiring any user interaction beyond visiting the crafted URL. This makes it suitable for drive-by download attacks or sophisticated phishing campaigns where the victim is tricked into loading a malicious site. The ability to read memory inside the sandbox means that attackers could potentially map out the browser's internal structures, facilitating further exploitation attempts against other components of the Chromium engine on iOS devices such as iPhones and iPads.
Mitigation for this vulnerability requires immediate action by users and administrators. The primary defense is upgrading Google Chrome for iOS to version 156.0.8078.47 or later, where these memory management issues in the navigation component have been patched through rigorous code reviews and fuzzing efforts. Users should enable automatic updates whenever possible to ensure they are protected against newly disclosed vulnerabilities without manual intervention. Additionally, employing browser security extensions that restrict script execution on untrusted domains can provide an additional layer of defense by limiting the attack surface available to malicious web pages. Organizations relying on Chrome for iOS in enterprise environments should enforce device management policies that mandate up-to-date software versions and consider implementing content security policies if embedding web views within native applications, ensuring that only trusted sources are allowed to execute scripts. Regular monitoring of browser update notifications is essential given the rapid pace at which mobile browsers evolve and patch such critical infrastructure flaws.