CVE-2026-110920 in Chrome
Summary
by MITRE • 10/16/2026
Memory corruption in V8 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: High)
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified within the V8 JavaScript engine, which powers Google Chrome and other Chromium-based browsers prior to version 155.0.8059.84, represents a critical memory corruption flaw that undermines the browser's core security model. This issue stems from improper handling of memory operations during the execution of complex scripts or malformed web content. When an attacker crafts a specific HTML page containing malicious JavaScript code designed to exploit this defect, they can trigger undefined behavior within the V8 engine’s garbage collection or type system mechanisms. The root cause typically involves a race condition, use-after-free scenario, or buffer overflow that allows for arbitrary read and write access to memory regions outside of intended boundaries. This flaw is classified under CWE-125 (Out-of-bounds Read) or CWE-787 (Out-of-bounds Write), depending on the specific manifestation within the engine’s internal data structures.
The operational impact of this vulnerability is severe due to its potential for remote code execution without user interaction beyond visiting a malicious website. Attackers can leverage this memory corruption to bypass Chrome’s sandboxing mechanisms, which are designed to isolate web content from the underlying operating system and sensitive user data. By achieving arbitrary code execution within the browser process, an attacker gains the ability to execute commands on the victim's machine, install malware, exfiltrate sensitive information such as cookies or session tokens, and potentially pivot to attack other systems on the local network. The Chromium security team has rated this issue with a High severity level, reflecting its significant potential for exploitation in real-world scenarios where attackers frequently deploy sophisticated phishing campaigns or drive-by download techniques targeting browser vulnerabilities.
From an offensive security perspective, this vulnerability aligns with ATT&CK technique T1203 (Exploitation for Client Execution), as it relies on tricking a user into loading malicious content that exploits client-side software flaws to achieve initial access and execution. The exploitation chain often involves crafting HTML pages that utilize specific JavaScript patterns to trigger the memory corruption, followed by shellcode injection or ROP chains to escalate privileges from the sandboxed renderer process to the browser’s main process or host system. This transition is critical because it breaks the isolation guarantees provided by modern browsers, allowing full control over the compromised environment.
Mitigation strategies primarily focus on timely patching and defense-in-depth measures. Users must update Google Chrome to version 155.0.8059.84 or later immediately upon availability, as this release contains the necessary code fixes that address the memory management errors within V8. For organizations managing large fleets of devices, deploying automated endpoint detection and response solutions can help identify suspicious processes spawned by browser instances, providing an additional layer of security even if a zero-day exploit is attempted before patching occurs. Additionally, enabling Chrome’s Site Isolation feature ensures that each website runs in its own process with restricted memory access, which significantly raises the difficulty for attackers to escape the sandbox and achieve arbitrary code execution on the host system. Regularly updating browser components and disabling unnecessary plugins further reduces the attack surface available to adversaries attempting to leverage such vulnerabilities.