CVE-2026-84349 in Chrome
Summary
by MITRE • 09/02/2026
Use after free in Browser in Google Chrome prior to 152.0.7977.75 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 • 09/02/2026
The vulnerability described constitutes a critical use-after-free flaw within the browser engine of Google Chrome, specifically affecting versions prior to 152.0.7977.75. This type of memory corruption error arises when a program continues to use a pointer after the memory it points to has been freed and potentially reallocated for other purposes. In the context of web browsers, such flaws are particularly dangerous because they can allow an attacker who has already achieved code execution within the renderer process sandbox to escalate privileges or escape that isolation boundary entirely. The Chromium security team classified this issue with a high severity rating, reflecting its potential to facilitate significant compromise of user systems when exploited in conjunction with other vulnerabilities or through sophisticated attack chains.
From a technical perspective, use-after-free vulnerabilities occur due to improper management of object lifecycles within the application's memory space. When an object is deallocated but references to it remain active, subsequent access to those dangling pointers can lead to unpredictable behavior. If the attacker controls the data that gets allocated in the freed memory region before the original pointer is dereferenced again, they can manipulate program flow or execute arbitrary code. In browser architectures like Chromium, which rely heavily on sandboxing to isolate untrusted web content from the host operating system, escaping this sandbox represents a severe security breach. The renderer process typically runs with limited privileges, but exploiting a use-after-free condition allows an attacker to write shellcode into memory and redirect execution flow, thereby breaking out of the restricted environment.
The operational impact of this vulnerability is substantial for end-users who rely on Chrome for browsing untrusted websites or opening maliciously crafted HTML pages. An adversary could distribute such a page via phishing campaigns, drive-by downloads, or compromised advertising networks. Once a victim visits the site, the browser processes the crafted content and triggers the memory corruption flaw. This enables remote code execution with the privileges of the user running the browser. Consequently, attackers can install malware, steal sensitive data such as cookies and passwords, conduct keystroke logging, or use the machine as part of a botnet. The ability to execute arbitrary code outside the sandbox effectively neutralizes one of the primary defense mechanisms employed by modern browsers, leaving the underlying operating system vulnerable to further exploitation.
To mitigate this risk, users must ensure that their Google Chrome installation is updated to version 152.0.7977.75 or later immediately upon availability. Automatic updates should be enabled to reduce the window of exposure during which known vulnerabilities remain unpatched. For enterprise environments, IT administrators should enforce update policies across all endpoints and consider deploying browser isolation technologies or sandboxing solutions that add additional layers of protection against renderer process escapes. Additionally, security awareness training can help users identify and avoid suspicious links and downloads that might trigger such exploits.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-416, which covers use after free errors. It also relates to MITRE ATT&CK techniques involving initial access through browser exploitation and privilege escalation via sandbox escape mechanisms. Understanding these mappings helps security teams prioritize patching efforts and configure detection rules within endpoint protection platforms that monitor for anomalous memory allocation patterns or unexpected process behavior indicative of such exploits. Regular vulnerability scanning and adherence to secure coding practices in web development can further reduce the likelihood of encountering similar issues in future software versions.