Cursor Marketplace returns HTTP 503 for extension search and installation

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Title: Cursor Marketplace returns HTTP 503 for extension search and installation

Environment:

  • OS: Linux x64
  • Cursor version: 3.27.22
  • Marketplace: https://marketplace.cursorapi.com
  • Date: October 30, 2026

Issue:

Searching for any extension in Cursor returns Server returned 503.

Installing extensions through the CLI also fails:

cursor --install-extension openai.chatgpt

Diagnostics:

  • Microsoft VS Code Marketplace extension query: HTTP 200
  • Cursor Marketplace homepage: accessible
  • Cursor Marketplace extensionquery POST: HTTP 503
  • Response code: unavailable
  • Response message: Service Unavailable
  • isRetryable: false
  • Cloudflare location: SIN
  • Request ID: 53253045-56b7-4533-a4b2-a1f89ad59a2f
  • Cloudflare Ray ID: a52844820b160b9e-SIN

The issue is reproducible using curl independently of the Cursor GUI.

Could you investigate the Marketplace backend or upstream service availability?

Steps to Reproduce

  1. Launch Cursor IDE version 3.27.22 on Linux x64.
  2. Open the Extensions panel using Ctrl + Shift + X.
  3. Search for any extension, such as Python or Codex.
  4. Observe that the extension list fails to load and displays Server returned 503.
  5. Open a Linux terminal and execute:
    cursor --install-extension openai.chatgpt
  6. Observe that the CLI installation also fails with Error while installing extensions: Server returned 503.
  7. Independently send a POST request to https://marketplace.cursorapi.com/_apis/public/gallery/extensionquery using curl with a valid extension search payload.
  8. Confirm that the API returns HTTP 503 with code: unavailable and Service Unavailable.

For comparison, the equivalent Microsoft VS Code Marketplace API request returns HTTP 200 on the same machine and network.

The issue is consistently reproducible and does not appear to be specific to any individual extension.

Expected Behavior

The Cursor Extensions Marketplace should load and display matching extensions when searching for keywords such as “Python” or “Codex”.

Users should be able to browse, install, and update extensions through both the Cursor IDE and the command-line interface without encountering HTTP 503 errors.

The Marketplace extension query API should return HTTP 200 with valid extension search results instead of “Service Unavailable”.

Operating System

Linux

Version Information

Version: 3.27.22
VS Code Extension API: 1.128.0
Commit: b1aa50cb6db84fd3e8c808259cb172ea73425c10
Date: 2026-10-27T00:33:02.045Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 42.11.16
Chromium: 148.0.7778.280
Node.js: 24.19.0
V8: 14.8.178.38-electron.0
xterm.js: 6.1.0-beta.291
OS: Linux x64 6.8.0-147-generic

Does this stop you from using Cursor

No - Cursor works, but with this issue

4

Hi @Tommy_Ding

The marketplace should be back. Can you try again?