CVE-2026-61568
@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport
- State
- Published
- Severity
- 9.6 Critical
- Published
- Sep 15, 2026
- Updated
- Sep 16, 2026
- Reserved
- Jul 10, 2026
Description
`@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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H | GitHub_M |
Weaknesses
- CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action
Affected Products
| Product | Versions |
|---|---|
gitlab-mcpzereight |
|
References
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