CVE-2026-61568: Zereight GitLab-Mcp

Critical severity, CVSS 9.6. EPSS: 0.5% chance of exploitation in the next 30 days.

`@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 products

• Zereight GitLab-Mcp: before 2.1.30 (fixed in 2.1.30)

Published 2026-09-15. Last modified 2026-09-30.