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, requiring nothing more than a victim visiting a crafted HTML page. With Chrome commanding 66.7 percent of the global browser market as of March 2026, 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 lies in Chrome's Forms component, which is responsible for handling HTML form elements. The code contained a dangling pointer defect: after a form related object's memory was freed, a subsequent 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 vector is network based with low attack complexity, though it does require user interaction. The exploitation flow works as follows:
- The attacker crafts a malicious HTML page designed to trigger the use after free condition in Chrome's Forms handling code.
- The attacker distributes this page to potential victims, likely via phishing emails or by hosting it on a compromised website.
- When a victim navigates to the page using a vulnerable version of Chrome (prior to 147.0.7727.101), the crafted HTML triggers the memory corruption condition in the Forms component.
- The freed memory region is referenced after deallocation, and the attacker leverages this to achieve arbitrary code execution inside the Chrome renderer sandbox.
Impact Assessment
Successful exploitation results in arbitrary code execution confined within the Chrome sandbox environment. While the sandbox restricts direct access to the underlying operating system, the NVD CVSS 3.1 base score of 8.8 (High) reflects high impact across confidentiality, integrity, and availability. Tenable assigns an even more severe CVSS 2.0 score of 10 (Critical). Sandbox escapes, while not part of this specific vulnerability, could potentially be chained with a separate exploit to achieve full system compromise.
Patch Information
Google addressed CVE-2026-6316 through a Stable Channel update for Chrome Desktop, published on April 15, 2026. The fix ships in the following versions:
| Operating System | Minimum Secure Version |
|---|---|
| Linux | 147.0.7727.101 |
| Mac | 147.0.7727.101 or 147.0.7727.102 |
| Windows | 147.0.7727.101 or 147.0.7727.102 |
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 practice for Chromium security bugs, this issue remains access restricted. Its details, including the exact commit diff and code changes, are not yet publicly visible. Google typically lifts these restrictions only after a sufficient percentage of the user base has updated, preventing adversaries from reverse engineering the fix before deployments roll out.
While the specific code level changes are not yet available for public review, the nature of the fix can be reasoned about from the vulnerability class. Use after free patches in Chromium typically follow well established patterns: either the lifetime of the referenced object is extended (for example, converting a raw pointer to a reference counted smart pointer like scoped_refptr or using base::SafeRef), or the code is restructured so that the stale reference is never dereferenced after the owning object is destroyed. In the Forms component specifically, this likely involves ensuring that callbacks or event handlers attached to form elements do not outlive the form objects they reference.
Users and administrators should verify that Chrome has auto updated to version 147.0.7727.101 or later by visiting chrome://settings/help. Other Chromium based browsers, including Microsoft Edge, Brave, Opera, and Vivaldi, will need to integrate the upstream fix separately, so users of those browsers should monitor their respective update channels.
Affected Systems and Versions
The vulnerability affects all Google Chrome installations prior to version 147.0.7727.101 across all supported platforms:
- 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
A corresponding Android build at the same version is also affected for versions prior to the fix.
Vendor Security History
Google maintains one of the most active vulnerability reward programs in the industry. In 2025, Google paid over $17 million to security researchers through its bug bounty program, with $3.7 million specifically allocated to Chrome vulnerabilities. Use after free bugs are a recurring vulnerability class in Chromium; the browser's large C++ codebase and complex object lifecycle management in rendering components make this category of flaw a persistent challenge. Google's investment in memory safety tooling and its ongoing migration toward safer memory management patterns reflect the scale of this effort.
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)
