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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61568
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 21:16:41 UTC
Updated2026-09-30 17:51:56 UTC
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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.005320000 probability, percentile 0.428720000 (date 2026-10-01)

Problem Types: CWE-350 | CWE-350 CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zereight Gitlab-mcp affected < 2.1.30 Not specified

References

ReferenceSourceLinkTags
github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7 [email protected] github.com
github.com/zereight/gitlab-mcp/pull/555 [email protected] github.com
github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb56... [email protected] github.com
github.com/zereight/gitlab-mcp/releases/tag/v2.1.30 [email protected] github.com
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