CVE-2026-110915 in Chrome
Summary
by MITRE • 10/16/2026
Use after free in Compositing in Google Chrome prior to 155.0.8059.84 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified as a use-after-free error within the compositing subsystem of Google Chrome prior to version 155.0.8059.84 represents a critical memory safety flaw that undermines the browser's sandbox integrity. This specific class of vulnerabilities arises when software continues to use a pointer after it has been freed, leading to undefined behavior that can be exploited by malicious actors. In the context of web browsers, the compositing engine is responsible for managing layers and rendering visual elements efficiently. When an object representing a compositor layer or related data structure is deallocated but remains referenced by another part of the application due to improper lifecycle management, accessing this dangling pointer allows an attacker to read or write arbitrary memory locations. This scenario was triggered specifically through interaction with a crafted HTML page, indicating that the exploit vector relies on standard web technologies rather than requiring external plugins or out-of-band interactions.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they can often be leveraged to achieve arbitrary code execution, which is precisely what occurred in this instance despite Chrome's robust sandboxing mechanisms. The Chromium security team classified the severity of this issue as Medium, likely reflecting the complexity required to reliably exploit the flaw or the specific conditions under which it could be triggered. However, the potential impact remains severe because successful exploitation allows a remote attacker to execute arbitrary code within the browser process context. While modern browsers employ multiple layers of defense such as heap hardening and control flow integrity, sophisticated attackers can often bypass these protections by carefully crafting memory states during the use-after-free window. This enables the injection of shellcode or the hijacking of execution flows, effectively breaking out of the restricted environment intended to isolate web content from the host operating system.
The operational impact of this vulnerability extends beyond individual user compromise to broader security implications for organizations relying on Chrome as their primary browsing platform. An attacker who successfully exploits this flaw can potentially access sensitive data stored in browser memory, such as cookies, session tokens, and autofill information. Furthermore, code execution within the sandbox may serve as a stepping stone for further attacks against the underlying operating system if additional vulnerabilities are present or if specific sandbox escape techniques are employed. This aligns with common attack patterns observed in advanced persistent threats where initial access is gained through web-based vectors to establish persistence or move laterally within a network infrastructure. The existence of such flaws highlights the ongoing challenge of maintaining memory safety in complex software systems like browsers, which handle vast amounts of dynamic content and user interactions daily.
To mitigate the risks associated with this vulnerability, it is imperative that all users update Google Chrome to version 155.0.8059.84 or later as soon as possible. This patch includes fixes for the memory management issues within the compositing engine that prevent the dangling pointer from being accessed after deallocation. For enterprise environments, administrators should ensure that automatic updates are enabled or deploy patches via centralized management tools to minimize the window of exposure. Additionally, organizations can enhance their security posture by implementing application whitelisting and restricting script execution where feasible, although these measures serve as compensating controls rather than direct fixes for memory corruption bugs. Regularly monitoring vendor advisories and maintaining up-to-date software configurations remain essential practices in defending against zero-day exploits and known vulnerabilities alike.
This incident underscores the importance of adhering to established security frameworks that emphasize continuous patch management and vulnerability remediation. The flaw maps conceptually to CWE-416, which describes use after free errors, a category of bugs frequently cited in software assurance guidelines as high-risk due to their potential for remote code execution. Furthermore, from an adversary tactics perspective, this exploitation method aligns with ATT&CK techniques related to initial access and privilege escalation via web application attacks. By understanding the mechanics behind such vulnerabilities, security teams can better prioritize remediation efforts and improve detection capabilities for similar memory corruption attempts in future incidents. The resolution of this issue demonstrates the effectiveness of proactive vulnerability management when combined with timely software updates provided by vendors like Google Chrome.