CVE-2026-113004 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Sync 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: Low)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as CVE-2024-9343 represents a critical memory corruption flaw within the Sync component of Google Chrome, specifically affecting versions prior to 156.0.8078.47. This defect allows for arbitrary code execution by leveraging improperly managed memory operations during synchronization processes. The security severity is classified as Low by Chromium standards due to the complexity required to exploit the issue and the presence of robust sandboxing mechanisms, yet it remains a significant risk vector because it enables remote attackers to bypass standard isolation boundaries through sophisticated crafting of web content.
The technical root cause lies in how Chrome handles memory allocation and deallocation within its Sync subsystem when processing data from external sources. Specifically, the flaw involves a use-after-free or heap overflow condition where pointers are not correctly invalidated after memory is freed, or bounds checking fails during write operations. When an attacker hosts a malicious HTML page containing specially crafted scripts or embedded objects that trigger these synchronization routines, they can manipulate the internal state of the browser's memory layout. This manipulation allows for overwriting adjacent memory structures with controlled data, effectively gaining control over program execution flow and enabling the injection and execution of arbitrary shellcode within the context of the Chrome process.
From an operational perspective, this vulnerability poses a severe threat to user privacy and system integrity despite its low severity rating in terms of exploit difficulty. A successful exploitation allows a remote attacker to execute code inside the browser's sandbox environment. While modern browsers employ multiple layers of defense such as site isolation, hardware-enforced stack protection, and address space layout randomization, breaking out of these sandboxes can lead to full system compromise if subsequent privilege escalation techniques are employed. The impact includes potential theft of sensitive data stored locally by the browser, installation of persistent malware, or use of the infected machine as part of a botnet for further attacks against other targets on the network.
This incident aligns with Common Weakness Enumeration (CWE) categories such as CWE-120 Buffer Overflow without null termination and CWE-416 Use After Free, which are prevalent in complex software systems like web browsers where high-performance memory management is critical. In terms of attack tactics, this vulnerability maps to MITRE ATT&CK techniques including T1059 Command and Scripting Interpreter for executing injected code and potentially T1203 Exploitation for Client Execution if the crafted HTML page triggers automatic download or execution behaviors depending on user interaction levels.
Mitigation strategies primarily involve immediate patching of all affected Chrome instances to version 156.0.8078.47 or later, which contains the necessary code fixes to validate memory pointers and enforce strict bounds checking during sync operations. Organizations should ensure that automatic update mechanisms are enabled for end-user devices to minimize exposure windows. Additionally, security teams can implement browser policies to restrict execution of untrusted scripts in certain contexts, although this may impact functionality. Monitoring network traffic for unusual outbound connections from Chrome processes post-exploitation attempts and deploying endpoint detection and response solutions capable of identifying anomalous memory access patterns can provide additional layers of defense against exploitation of similar vulnerabilities in the future.