What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-350

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 products

• zereight gitlab-mcp: before 2.1.30

References

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

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