Brief Summary: Google Chrome CVE-2026-6316 Use After Free in Forms Component

Introduction

A use-after-free vulnerability in Google Chrome's Forms component gives remote attackers a path to arbitrary code execution inside the renderer sandbox. All it takes is a victim visiting a crafted HTML page. Chrome held 66.7 percent of the global browser market as of March 2026, so the potential attack surface for CVE-2026-6316 is substantial, and organizations should treat fleet-wide patching as a priority.

Technical Information

CVE-2026-6316 is classified under CWE-416 (Use After Free). The root cause is in Chrome's Forms component, which handles HTML form elements. The code contained a dangling-pointer defect: after the memory for a form-related object was freed, a later code path could still reference that now invalid memory region. When triggered, this condition leads to unpredictable behavior or, in the worst case, arbitrary code execution.

Attack Vector and Exploitation Flow

The attack arrives over the network with low attack complexity, but it requires user interaction. The exploitation flow works as follows:

1. The attacker crafts a malicious HTML page designed to trigger the use-after-free condition in Chrome's Forms handling code.
2. The attacker distributes this page to potential victims, likely through phishing emails or by hosting it on a compromised website.
3. When a victim opens the page in a vulnerable version of Chrome (prior to 147.0.7727.101), the crafted HTML triggers the memory corruption condition in the Forms component.
4. Chrome references the freed memory region after deallocation, and the attacker uses this to achieve arbitrary code execution inside the Chrome renderer sandbox.

Impact Assessment

Successful exploitation gives the attacker arbitrary code execution confined within the Chrome sandbox. The sandbox restricts direct access to the underlying operating system, but the NVD CVSS 3.1 base score of 8.8 (High) still reflects high impact on confidentiality, integrity, and availability. Tenable assigns an even more severe CVSS 2.0 score of 10 (Critical). This vulnerability does not include a sandbox escape, but an attacker could chain it with a separate sandbox escape exploit to achieve full system compromise.

Patch Information

Google fixed CVE-2026-6316 in a Stable Channel update for Chrome Desktop published on April 15, 2026. The fix ships in the following versions:

Any Chrome installation running a version prior to 147.0.7727.101 remains vulnerable.

The patch is tracked in the Chromium issue tracker under issue 499384399. As is standard for Chromium security bugs, the issue is still access restricted, and its details, including the exact commit diff and code changes, are not yet public. Google typically lifts these restrictions only after a sufficient percentage of the user base has updated, so that adversaries cannot reverse engineer the fix before the update reaches most users.

The code-level changes are not yet available for review, but the vulnerability class suggests what the fix looks like. Use-after-free patches in Chromium typically follow well-established patterns. Either the patch extends the lifetime of the referenced object (for example, by converting a raw pointer to a reference-counted smart pointer like scoped_refptr or by using base::SafeRef), or it restructures the code so that the stale reference is never dereferenced after the owning object is destroyed. In the Forms component, the fix likely makes sure that callbacks or event handlers attached to form elements do not outlive the form objects they reference.

Users and administrators should confirm that Chrome has updated itself to version 147.0.7727.101 or later by visiting chrome://settings/help. Other Chromium-based browsers, including Microsoft Edge, Brave, Opera, and Vivaldi, need to integrate the upstream fix separately, so users of those browsers should watch their own vendor's update channel.

Affected Systems and Versions

The vulnerability affects all Google Chrome installations prior to version 147.0.7727.101 on every supported platform:

• Google Chrome for Linux: All versions prior to 147.0.7727.101
• Google Chrome for macOS: All versions prior to 147.0.7727.101
• Google Chrome for Windows: All versions prior to 147.0.7727.101

Chrome for Android is also affected in versions prior to the corresponding fixed build at the same version.

Vendor Security History

Google runs one of the most active vulnerability reward programs in the industry. In 2025, it paid over $17 million to security researchers through its bug bounty program, and $3.7 million of that went to Chrome vulnerabilities. Use-after-free bugs are a recurring vulnerability class in Chromium. The browser's large C++ codebase and the complex object lifecycle management in its rendering components make this category of flaw a persistent challenge, and Google has met it with investment in memory-safety tooling and an ongoing migration toward safer memory management patterns.

References

• NVD Entry for CVE-2026-6316
• CVE Record: CVE-2026-6316
• Chrome Stable Channel Update for Desktop (April 15, 2026)
• Chromium Issue Tracker: Issue 499384399
• Tenable: CVE-2026-6316
• HKCERT: Google Chrome Multiple Vulnerabilities
• The Hacker Wire: CVE-2026-6316
• Google Paid Out $17 Million in Bug Bounty Rewards in 2025 (SecurityWeek)
• Google Awards Over $17 Million to Security Researchers in 2025 (SC World)
• Chromium VRP FAQ
• Browser Market Share Worldwide (Statcounter, March 2026)