vulnerability / NVI-00020097 / Revision 1
@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport
GitHub lists this reviewed advisory for @zereight/mcp-gitlab. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
9.6 critical
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
@zereight/mcp-gitlab
source listed< 2.1.30
`@zereight/mcp-gitlab` exposes its 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. This is CWE-350, Reliance on Reverse DNS Resolution for a Security-Critical Action. The affected package is `@zereight/mcp-gitlab` version `2.1.18` at commit `74a8c834424ff557ad8bc6f225e4dc5acf80aa13`. The vulnerable transport setup is in `index.ts`. Express JSON parsing is installed globally before any MCP route-level Host or Origin allowlist: ```typescript // index.ts:12077 app.use(express.json()); registerDownloadProxy(app); ``` The Streamable HTTP transport is then created without the SDK DNS-rebinding controls: ```typescript // index.ts:12375 transport = new StreamableHTTPServerTransport({ sessionIdGenerator: () => randomUUID(), onsessioninitialized: (newSessionId: string) => { streamableTransports[newSessionId] = transport; metrics.totalSessions++; metrics.act
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-vmp7-252j-cwp7 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.