CVE-2026-61568: CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action in zereight gitlab-mcp
`@zereight/mcp-gitlab` versions prior to 2.1.30 have a critical vulnerability where the Streamable HTTP MCP endpoint lacks an effective Host or Origin allowlist. This allows a malicious web page to exploit DNS rebinding to send requests to a victim's local MCP listener with attacker-controlled Host and Origin headers, bypassing HTTP boundary checks. Version 2.1.30 includes a patch to fix this issue.
AI Analysis
Technical Summary
The vulnerability in `@zereight/mcp-gitlab` (prior to version 2.1.30) involves reliance on reverse DNS resolution for security-critical actions, specifically in the Streamable HTTP MCP endpoint. Without an effective Host or Origin allowlist, an attacker can use DNS rebinding to manipulate browser requests to the victim's local MCP listener, preserving attacker-controlled Host and Origin headers. This causes the server to accept these headers and proceed to the MCP initialization path instead of rejecting the request at the HTTP boundary. The issue is addressed in version 2.1.30 by implementing appropriate validation.
Potential Impact
Successful exploitation allows an attacker to bypass HTTP boundary checks and potentially perform unauthorized actions via the MCP initialization path. The CVSS score of 9.6 indicates critical impact with high confidentiality, integrity, and availability consequences. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to version 2.1.30 or later, which contains the official patch addressing this vulnerability. No other mitigations are indicated by the vendor advisory.
CVE-2026-61568: CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action in zereight gitlab-mcp
Description
`@zereight/mcp-gitlab` versions prior to 2.1.30 have a critical vulnerability where the Streamable HTTP MCP endpoint lacks an effective Host or Origin allowlist. This allows a malicious web page to exploit DNS rebinding to send requests to a victim's local MCP listener with attacker-controlled Host and Origin headers, bypassing HTTP boundary checks. Version 2.1.30 includes a patch to fix this issue.
CVSS v3.1
Score 9.6critical
Affected software
zereight
gitlab-mcp
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in `@zereight/mcp-gitlab` (prior to version 2.1.30) involves reliance on reverse DNS resolution for security-critical actions, specifically in the Streamable HTTP MCP endpoint. Without an effective Host or Origin allowlist, an attacker can use DNS rebinding to manipulate browser requests to the victim's local MCP listener, preserving attacker-controlled Host and Origin headers. This causes the server to accept these headers and proceed to the MCP initialization path instead of rejecting the request at the HTTP boundary. The issue is addressed in version 2.1.30 by implementing appropriate validation.
Potential Impact
Successful exploitation allows an attacker to bypass HTTP boundary checks and potentially perform unauthorized actions via the MCP initialization path. The CVSS score of 9.6 indicates critical impact with high confidentiality, integrity, and availability consequences. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to version 2.1.30 or later, which contains the official patch addressing this vulnerability. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-10T16:48:39.924Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa9b25a55bf5e2cf55e9559
Added to database: 09/15/2026, 21:02:18 UTC
Last enriched: 09/15/2026, 21:16:36 UTC
Last updated: 09/15/2026, 21:21:30 UTC
Views: 5
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