CVE-2026-113139 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Autofill in Google Chrome 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 • 10/22/2026
The vulnerability identified as CVE-2024-9389 represents a critical security flaw within the Autofill component of Google Chrome, specifically affecting versions prior to 156.0.8078.47. This issue stems from improper memory management practices that lead to corruption during the processing of user input data intended for automatic form filling. The core technical defect involves a failure in boundary checks or type safety enforcement when handling complex autofill structures, which allows an attacker to manipulate internal state variables beyond their allocated limits. Such errors typically manifest as heap-based buffer overflows or use-after-free conditions, where memory regions are accessed after they have been freed or written past their intended boundaries. This specific instance was classified with a medium severity rating by the Chromium security team, indicating that while the vulnerability is significant and exploitable under certain conditions, it may require additional steps to achieve full impact compared to high-severity issues like arbitrary code execution without sandbox escape.
The operational impact of this vulnerability centers on the potential for unauthorized memory disclosure within the browser's sandboxed environment. By crafting a malicious HTML page that triggers the flawed autofill logic, an attacker can cause Chrome to read and expose sensitive data residing in adjacent memory blocks. This could include session cookies, authentication tokens, or other personally identifiable information stored by the browser for convenience. Although the attack is confined within the renderer process sandbox due to Chrome's multi-process architecture, successful exploitation allows a remote adversary to bypass certain isolation mechanisms through side-channel effects or subsequent attacks that leverage the leaked data. The ability to read memory inside the sandbox undermines the confidentiality guarantees provided by the browsing context and can serve as a stepping stone for more severe exploits if combined with other vulnerabilities in the browser engine or operating system kernel.
From an industry standards perspective, this vulnerability aligns closely with CWE-120 Buffer Copy without Checking Size of Input Classic Buffer Overflow and potentially CWE-416 Use After Free depending on the exact memory state at time of access. In terms of attack vectors, it maps to MITRE ATT&CK technique T1059 Command and Scripting Interpreter via HTML-based scripts or T1203 Exploitation for Client Execution if further payload delivery is involved. The exploitation requires user interaction in the form of visiting a malicious webpage, which places this vulnerability within the context of web application attacks rather than passive network-level exploits. Defenders should note that while sandbox isolation mitigates direct system compromise, memory disclosure remains a high-risk outcome due to its potential for credential theft and session hijacking.
Mitigation strategies primarily involve immediate patching by upgrading Google Chrome to version 156.0.8078.47 or later where the autofill logic has been hardened with proper bounds checking and input validation. For organizations unable to update immediately, deploying web filtering solutions that block access to known malicious domains hosting crafted HTML pages can provide a layer of defense in depth. Additionally, enabling strict Content Security Policy headers on internal applications reduces the risk of executing untrusted scripts within browser contexts. Users should also ensure their operating systems are up to date as modern OS-level protections like ASLR and DEP complement browser sandboxing by making memory corruption attacks more difficult to exploit successfully. Continuous monitoring for anomalous network traffic originating from endpoints running older Chrome versions can help detect potential exploitation attempts in real time before significant damage occurs.