CVE-2026-106347 in Chrome
Summary
by MITRE • 10/07/2026
Use after free in Track in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Critical)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as a use-after-free condition within the Track component of Google Chrome prior to version 155.0.8059.39 represents a critical memory safety flaw that undermines the browser's sandboxing mechanisms. This type of error occurs when an application continues to use a pointer after the memory it points to has been freed, leading to undefined behavior that can be exploited by malicious actors. In this specific instance, the flaw resides in how Chrome handles objects related to tracking functionalities, which are often involved in processing web content and managing state across different contexts within the browser environment. The severity is classified as critical because successful exploitation allows for arbitrary code execution inside the sandbox, a security boundary designed to restrict what malicious websites can do if they manage to compromise the renderer process.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous in modern browsers due to their potential to bypass complex memory protection schemes such as Address Space Layout Randomization and heap spraying defenses. When an attacker crafts a specific HTML page that triggers this flaw, they can manipulate the state of freed memory regions to gain control over program execution flow. By carefully constructing the payload, the attacker can overwrite function pointers or object vtables with addresses pointing to shellcode injected into the browser's address space. This enables the remote attacker to execute arbitrary commands within the context of the compromised renderer process, effectively breaking out of the restricted environment intended to isolate web content from the rest of the system.
The operational impact of this vulnerability is severe, as it facilitates a remote code execution attack vector that does not require user interaction beyond visiting a maliciously crafted webpage. This aligns with common exploitation patterns found in advanced persistent threats and drive-by download attacks where users are lured to compromised or attacker-controlled sites. The ability to execute arbitrary code inside the sandbox significantly escalates the risk profile, as it may allow further lateral movement within the system if additional vulnerabilities exist for escaping the browser's containment zone entirely. This compromises not only the confidentiality and integrity of user data but also poses a direct threat to host security by potentially installing malware or establishing backdoors on the victim machine.
In terms of industry standards, this vulnerability maps closely to CWE-416, which defines use after free as an error where software uses memory after it has been freed, often leading to crashes or arbitrary code execution. Furthermore, from a threat intelligence perspective utilizing the MITRE ATT&CK framework, this exploit technique relates to techniques involving exploitation for privilege escalation and defense evasion, specifically how attackers leverage application vulnerabilities to gain initial access and potentially escalate privileges depending on subsequent exploits. The critical nature of the Chromium security severity rating underscores the urgency required in addressing such memory corruption issues that form the backbone of modern web browser security architectures.
Mitigation strategies primarily involve applying the official patch provided by Google Chrome version 155.0.8059.39 or later, which resolves the underlying memory management error within the Track component. Organizations should ensure automated update mechanisms are in place to minimize the window of exposure for end-users. Additionally, implementing strict content security policies and disabling unnecessary browser features can reduce the attack surface available to potential attackers. Security teams should also monitor for indicators of compromise associated with drive-by download campaigns targeting this specific vulnerability class, ensuring that any suspicious activity is detected and contained before it leads to full system compromise.