CVE-2026-113142 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Extensions 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)
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified as CVE-2024-9343 represents a critical memory corruption flaw within the Extensions subsystem of Google Chrome, specifically affecting versions prior to 156.0.8078.47. This defect stems from improper handling of data structures during the execution of extension code, leading to conditions where heap memory is accessed beyond its allocated boundaries or freed memory is referenced without proper validation. Such errors typically arise when the browser fails to correctly manage pointer arithmetic or array indexing within the complex logic governing how extensions interact with web pages and internal browser APIs. The severity of this issue is classified as Medium by Chromium security standards, reflecting a balance between the complexity required for exploitation and the potential impact on system integrity if successfully leveraged.
From a technical perspective, memory corruption vulnerabilities in sandboxed environments like Chrome are particularly dangerous because they challenge the fundamental isolation model that protects user data from malicious web content. When an attacker crafts a specific HTML page containing malicious JavaScript or embedded extension scripts, they can trigger this flaw to cause out-of-bounds reads. This allows the attacker to read arbitrary memory locations within the browser process sandbox. While the sandbox restricts direct access to sensitive system resources like file systems or network interfaces, reading internal memory structures can reveal pointers, cryptographic keys, session tokens, or other sensitive data that aids in further exploitation chains. The vulnerability is categorized under CWE-125, which denotes Out-of-bounds Read, a common class of defects where software reads data past the end or before the beginning of the intended buffer.
The operational impact of this vulnerability centers on information disclosure and potential privilege escalation within the browser context. By exploiting the out-of-bounds read, an attacker could potentially leak sensitive information stored in memory, such as cookies, local storage contents, or internal state variables that control extension behavior. This data can be used to hijack user sessions or gain deeper insights into the application's logic for more sophisticated attacks. Furthermore, depending on the specific implementation details and other mitigations present in the browser version, this initial read access could serve as a stepping stone for heap spraying techniques aimed at achieving arbitrary code execution, although such escalation is significantly harder due to modern sandboxing protections like ASLR and DEP. The attack vector is classified under ATT&CK technique T1059, specifically Command and Scripting Interpreter, as the exploitation relies on executing malicious scripts within the browser environment via a crafted web page.
Mitigation for this vulnerability primarily involves updating Google Chrome to version 156.0.8078.47 or later, where the underlying memory management logic in the Extensions component has been patched to enforce stricter bounds checking and validation of pointer operations. Organizations should ensure that their endpoint security policies mandate automatic updates for browser software to minimize exposure windows. Additionally, users can reduce risk by disabling unnecessary extensions, as each active extension increases the attack surface within the sandboxed environment. Security teams should also monitor for indicators of compromise related to unusual memory access patterns or unexpected network connections originating from browser processes, which may indicate an attempted exploitation of this flaw in environments where patching has not yet been applied.