# CVE-2026-52001: geelen mcp-remote information disclosure in SSE transport

Source: https://junglewise.ai/threats/cve-2026-52001-an-issue-in-geelen-mcp-remote-0-1-18-through-0-1-38-allows-a  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-52001 · Severity: info · Published 2026-09-24

geelen mcp-remote is a utility that connects MCP clients to remote MCP servers. An attacker can obtain sensitive information by exploiting a vulnerability in the Server-Sent Events (SSE) transport layer. The issue affects versions 0.1.18 through 0.1.38.

Technologies: [Geelen Mcp-Remote](https://junglewise.ai/threats/technologies/geelen-mcp-remote). Vendors: [Geelen](https://junglewise.ai/threats/vendors/geelen).

## Quick answers

**Is CVE-2026-52001 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-52001 being exploited in the wild.

**How severe is CVE-2026-52001?** Informational severity, published 24 September 2026.

**Which products and versions are affected?** Geelen Mcp-Remote 0.1.18 through 0.1.38.

**Is there a fix for CVE-2026-52001?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-52001 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-52001?** Check whether you run Geelen Mcp-Remote at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the SSE transport eventSourceInit fetch wrapper in src/lib/utils.ts. A remote attacker can exploit this to access sensitive information without requiring authentication or user interaction. The vulnerability is an information disclosure issue in the SSE transport mechanism.

## Affected products

- geelen mcp-remote 0.1.18 through 0.1.38

## Timeline

- 2026-09-24: disclosed

## References

- [https://github.com/geelen/mcp-remote](https://github.com/geelen/mcp-remote)
- [https://github.com/geelen/mcp-remote/security/advisories](https://github.com/geelen/mcp-remote/security/advisories)

## Related threats

- [geelen mcp-remote arbitrary code execution via open() functions](https://junglewise.ai/threats/cve-2026-51997-an-issue-in-geelen-mcp-remote-0-1-16-through-0-1-38-allows-a)
- [geelen mcp-remote remote code execution in getServerUrlHash](https://junglewise.ai/threats/cve-2026-51996-an-issue-in-geelen-mcp-remote-0-1-16-through-0-1-38-allows-a)
- [geelen mcp-remote information disclosure in authorization](https://junglewise.ai/threats/cve-2026-51995-an-issue-in-geelen-mcp-remote-0-1-32-through-0-1-38-allows-a)