CVE-2026-61568

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

`@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.

Affected

zereight · gitlab-mcp

CVSS v3.1 GITHUB

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

EPSS

0.53% chance of exploitation in the next 30 days, 44th percentile

Published

2026-09-15

Updated

2026-09-16

Proof-of-concept exploits (2)

• advisories/GHSA-vmp7-252j-cwp7
• kinryulabs/research-pocs0★ · 2026-10-01

References

• CVE Record
• NVD entry

Related

• CVE-2026-31431
• CVE-2026-77244
• CVE-2026-78683
• CVE-2026-85724