@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport (CVE-2026-61568) | HOL Guard CVE

Critical · CVSS 9.6CVE-2026-61568GHSA-VMP7-252J-CWP7

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

Answer in brief

CVE-2026-61568 records a Critical severity (CVSS 9.6) vulnerability in @zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport. The current sources do not mark it as known exploited. The current feed maps zereight/gitlab-mcp (generic), @zereight/mcp-gitlab (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.6
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps zereight/gitlab-mcp (generic), @zereight/mcp-gitlab (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
zereight/gitlab-mcpgeneric	< 2.1.30	Not reported
@zereight/mcp-gitlabnpm	<2.1.30	2.1.30

Recommended response

Check inventory. Check lockfiles and deployed manifests for zereight/gitlab-mcp, @zereight/mcp-gitlab.
Review the reported fix. Update @zereight/mcp-gitlab to 2.1.30 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.