Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

CVE-2026-61568@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport

Critical 9.6

In plain English

A critical-severity security flaw in gitlab-mcp from zereight. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.5%top 54.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@zereight/mcp-gitlab	2.1.30	GHSA-vmp7-252j-cwp7

Affected products (as reported)

Vendor	Product	Versions
zereight	gitlab-mcp	< 2.1.30

Weakness: CWE-350 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7 x_refsource_CONFIRM
https://github.com/zereight/gitlab-mcp/pull/555 x_refsource_MISC
https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290 x_refsource_MISC
https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30 x_refsource_MISC