CVE-2026-61568

Summary

@zereight/mcp-gitlab is a Model Context Protocol server for GitLab. Versions prior to 2.1.30 expose the Streamable HTTP MCP endpoint without an effective Host or Origin allowlist. A malicious web page can use DNS rebinding to route browser requests to a victim's local MCP listener while preserving an attacker-controlled Host and Origin. The server accepts those headers and reaches the MCP initialization path instead of rejecting the request at the HTTP boundary. Version 2.1.30 contains a patch.

Affected Software

VendorProductVersion RangeStatus
zereightgitlab-mcp< 2.1.30affected

Weaknesses

  • CWE-350: CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action

References