CVE-2026-85048 in Chrome
Summary
by MITRE • 09/03/2026
Use after free in Compositing in Google Chrome prior to 152.0.7977.82 allowed a remote attacker who had compromised the renderer process to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/05/2026
The vulnerability identified as a use-after-free condition within Google Chrome's compositing subsystem represents a critical memory safety flaw that undermines the browser's primary defense mechanism, the renderer process sandbox. This specific issue arises when the application attempts to access or manipulate a memory object after it has been freed, leading to undefined behavior that can be exploited by malicious actors. The root cause typically involves a race condition or improper lifecycle management of graphical resources during the rendering and compositing phases, where pointers to deallocated memory are retained and subsequently dereferenced under specific conditions triggered by crafted HTML content.
From an operational perspective, this vulnerability allows for arbitrary code execution outside the security sandbox if an attacker successfully compromises the renderer process. The significance of this escalation lies in the fact that modern browsers isolate web pages within sandboxes to limit the impact of potential exploits. By exploiting a use-after-free bug in the compositing layer, which is responsible for assembling visual elements into final frames on the screen, an attacker can achieve code execution with higher privileges than those granted to standard web content. This effectively bypasses the isolation boundaries designed to protect user data and system integrity from malicious websites or injected scripts.
The technical impact of this flaw aligns closely with CWE-416, which defines use-after-free errors as a class of vulnerabilities where software continues to use memory after it has been freed. In the context of browser engines like Blink, such errors are particularly dangerous because they can lead to heap corruption or control flow hijacking. The attacker crafts an HTML page that triggers the premature deallocation of a compositing resource while maintaining references to it. When these stale pointers are accessed during subsequent rendering operations, the attacker gains the ability to manipulate memory structures in ways that facilitate remote code execution. This scenario is consistent with ATT&CK technique T1059, specifically command and script interpretation through browser-based attacks, where the initial access vector involves a crafted web page leading to privilege escalation within the host environment.
Mitigation strategies for this vulnerability primarily involve applying the latest security patches provided by Google in Chrome version 152.0.7977.82 or later. These updates include fixes that enforce stricter memory management protocols and add checks to ensure that resources are not accessed after their lifecycle ends. Additionally, users should enable automatic update mechanisms to ensure timely application of such critical security patches. From a defensive standpoint, employing browser hardening techniques such as disabling JavaScript for untrusted sites can reduce the attack surface, although this may impact usability. Security teams should also monitor for indicators of compromise related to renderer process anomalies and ensure that endpoint detection systems are configured to flag unusual memory access patterns associated with exploitation attempts.