CVE-2026-61568 Details
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.
A vulnerability in the `@zereight/mcp-gitlab` package, specifically in versions prior to 2.1.30, allows for DNS rebinding attacks that can bypass local security boundaries. The Streamable HTTP Model Context Protocol (MCP) endpoint does not properly validate `Host` or `Origin` headers. This flaw enables a malicious web page to direct browser requests to a victim's local MCP listener, using an attacker-controlled `Host` and `Origin`. The server accepts these headers, leading to unauthorized processing of MCP initialization requests. In the affected version, the Streamable HTTP transport is created without DNS-rebinding protections, and the default loopback host is exploited by the attack.
Users can upgrade to version 2.1.30 or later, where this vulnerability has been patched. For those using earlier versions, it's recommended to manually implement the necessary DNS-rebinding protections and `Host`/`Origin` validation before the Streamable HTTP route.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 15, 2026CISA-ADP
Assessed Sep 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290 | [email protected] | Source CodeVendor |
| https://github.com/zereight/gitlab-mcp/pull/555 | [email protected] | Source CodeVendor |
| https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30 | [email protected] | Release NotesVendor |
| https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-350 | Reliance on Reverse DNS Resolution for a Security-Critical Action | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| @zereight/mcp-gitlab | < 2.1.30 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 16, 2026 | CVE Modified | CISA-ADP |
| Sep 15, 2026 | New CVE Received | [email protected] |