CVE-2026-87524 in Chrome
Summary
by MITRE • 09/09/2026
Use after free in Core in Google Chrome on on Windows prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described constitutes a critical use-after-free flaw within the core rendering engine of Google Chrome, specifically affecting versions prior to 153.0.8010.36 on Windows operating systems. This memory corruption issue arises when the browser fails to properly manage the lifecycle of certain objects in memory after they have been deallocated. In modern web browsers like Chrome, which utilize a multi-process architecture with strict sandboxing for security isolation, such flaws are particularly dangerous because they can potentially allow an attacker to escape these protective boundaries if exploited correctly. The severity is classified as high by Chromium standards due to the potential for arbitrary code execution outside the renderer process sandbox.
From a technical perspective, use-after-free vulnerabilities occur when a program continues to use a pointer after it has been freed or deallocated. In the context of Chrome's rendering engine, this typically involves JavaScript objects or DOM elements that are referenced by multiple parts of the browser's internal state machine. If one part of the code frees an object while another part still holds a reference to it and attempts to access its memory contents, undefined behavior occurs. An attacker can manipulate the timing of these operations through crafted HTML pages containing specific scripts designed to trigger race conditions or force premature deallocation. By carefully controlling what data is written into the freed memory region before it is reallocated for another purpose, an attacker can corrupt internal browser structures such as function pointers or virtual table entries.
The operational impact of this vulnerability is severe because it enables remote code execution with elevated privileges relative to the sandboxed renderer process. Typically, when a user visits a malicious website, any exploit attempts are confined within the low-privilege renderer process due to Chrome's security model. However, if an attacker successfully exploits this use-after-free condition in the core components that bridge between processes or manage shared memory structures, they can achieve arbitrary code execution in the higher-privileged browser process or even on the host system itself. This effectively neutralizes the sandboxing protection designed to limit the blast radius of web-based attacks, allowing full control over the victim's machine without requiring any user interaction beyond visiting the crafted webpage.
This type of vulnerability aligns with Common Weakness Enumeration identifier CWE-416, which defines use after free as a situation where an application uses memory that has already been freed. In terms of offensive security frameworks such as MITRE ATT&CK, this exploit technique falls under Tactic Execution and specifically relates to techniques like Arbitrary Code Injection or potentially Command and Scripting Interpreter abuse if the executed code leads further into system compromise. The attack vector is classified as remote via network (ATT&CK T1189), leveraging social engineering through a malicious webpage that triggers the vulnerability automatically upon loading in the browser environment.
Mitigation strategies primarily involve updating Google Chrome to version 153.0.8010.36 or later, where these memory management issues have been addressed by developers through improved reference counting mechanisms and stricter validation of object lifecycles within the rendering engine. For organizations unable to update immediately due to compatibility constraints, implementing application whitelisting can help prevent unauthorized code execution even if the sandbox is bypassed. Additionally, deploying browser isolation solutions or web filtering proxies that block access to untrusted domains containing complex script-heavy content can reduce exposure to such zero-day style exploits until patches are applied. Regular patch management cycles and monitoring for new security advisories from Google regarding Chrome stability releases remain essential defensive measures against memory corruption vulnerabilities in widely used web browsers.