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

> Attackers can use DNS rebinding to bypass host checks and access local GitLab MCP endpoints, potentially reading data or bypassing security controls.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 15 Sep 2026
- **Updated:** 16 Sep 2026
- **Also known as:** GHSA-vmp7-252j-cwp7

## What is CVE-2026-61568?

CVE-2026-61568 is a critical server-side request forgery vulnerability in zereight gitlab-mcp, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-350 (Reliance on Reverse DNS Resolution for a Security-Critical Action)

## Which versions are affected by CVE-2026-61568?

2 open source packages ship an affected version, including @zereight/mcp-gitlab.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@zereight/mcp-gitlab` | npm | All versions | 2.1.30 |
| `@zereight/mcp-gitlab` | npm | All versions | 2.1.30 |

## How do I fix CVE-2026-61568?

Upgrade @zereight/mcp-gitlab to 2.1.30 or later.

## Is CVE-2026-61568 being exploited?

There is no known exploitation of CVE-2026-61568 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61568 and fix it if it is affected.

What it is: CVE-2026-61568 is a critical server-side request forgery vulnerability in zereight gitlab-mcp, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-61568 in the wild and no public exploit code.

Affected packages and fixed versions:
- @zereight/mcp-gitlab (npm): affected all versions; fixed in 2.1.30
- @zereight/mcp-gitlab (npm): affected all versions; fixed in 2.1.30

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-61568/ (Markdown: https://insights.sbomify.com/CVE-2026-61568/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61568
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61568
- OSV: https://osv.dev/vulnerability/CVE-2026-61568

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-61568/
Summaries are generated and may contain mistakes; the official description above is the record.