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Vulnerability advisory

GO-2026-5779

GitHub MCP Server: Lockdown mode singleton in HTTP server causes cross-user GraphQL client confusion in github.com/github/github-mcp-server

Published Updated OSV record ↗

Also known as CVE-2026-48529GHSA-pjp5-fpmr-3349

Severity

Severity not reported.

Affected versions

github.com/github/github-mcp-server Go

All github.com/github/github-mcp-server advisories →
AffectedFixed in
0.22.0 to before 1.1.21.1.2

Description

GitHub MCP Server: Lockdown mode singleton in HTTP server causes cross-user GraphQL client confusion in github.com/github/github-mcp-server

References

  • Codex
  • Claude Code
  • VS Code
  • GitHub Copilot
  • Cursor
  • Cline
  • Windsurf
  • Google Anti-gravity
  • OpenCode
  • Pi
  • Gemini CLI
  • Hermes Agent
  • Zed
  • Junie
  • Qwen Code
  • Kiro
  • Kilo Code
  • Factory Droid

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