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CVE-2026-61568

@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport

CVSS 3.1 9.6 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-61568

Published

`@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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-61568

Published

gitlab-mcp

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "zereight",
                    "product": "gitlab-mcp",
                    "versions": [
                        {
                            "version": "< 2.1.30",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON