CVE-2026-95310 in Chrome
Summary
by MITRE • 09/29/2026
Use after free in AdFilter in Google Chrome prior to 154.0.8037.57 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as a use-after-free condition within the AdFilter component of Google Chrome prior to version 154.0.8037.57 represents a critical memory safety flaw that undermines the browser's core security architecture. This specific defect arises from improper management of object lifecycles, where the application continues to reference a memory block after it has been freed or deallocated by the system. In the context of web browsers, such errors are particularly dangerous because they can be triggered remotely through maliciously crafted HTML pages that exploit the browser's rendering and filtering engines during normal page load operations.
From a technical perspective, this flaw falls under the Common Weakness Enumeration category CWE-416, which classifies use-after-free vulnerabilities as situations where pointers to freed memory are used in ways that can lead to undefined behavior or security breaches. When an attacker crafts a specific HTML payload designed to trigger the AdFilter logic prematurely while retaining references to deallocated objects, they gain control over how the browser interprets subsequent operations on that invalid memory address. This misinterpretation allows for arbitrary code execution because the attacker can manipulate heap metadata or overwrite adjacent data structures with controlled values, effectively hijacking the program's flow of execution.
The operational impact of this vulnerability is severe due to its ability to bypass Chrome's sandboxing mechanisms. Modern browsers rely heavily on process isolation and sandboxes to restrict what web content can do, limiting potential damage from compromised pages to a single tab or renderer process. However, by exploiting a use-after-free in the AdFilter component, an attacker can achieve arbitrary code execution outside of this restricted environment. This escalation allows the malicious script to interact directly with the operating system and underlying hardware, potentially leading full compromise of the victim's device including data theft, installation of persistent malware, or lateral movement within a network if the user has elevated privileges.
This incident aligns closely with MITRE ATT&CK techniques related to execution and privilege escalation, specifically those involving exploitation for client-side code injection and sandbox escape. The ability to execute arbitrary code outside the sandbox transforms what might otherwise be a contained cross-site scripting or rendering issue into a full system compromise scenario. It highlights the critical importance of robust memory management in complex software like web browsers where user-supplied content is processed dynamically and frequently.
Mitigation for this vulnerability primarily involves updating Google Chrome to version 154.0.8037.57 or later, which contains patches addressing the lifecycle management issues within the AdFilter component. Organizations should enforce automated update policies to ensure all endpoints are running patched versions of the browser promptly after release. Additionally, security teams can implement application whitelisting and strict content security policies to reduce the attack surface by preventing the execution of untrusted scripts or limiting interactions with potentially vulnerable components until patches are verified as stable in production environments.