Markdownify MCP Server allows Server-Side Request Forgery (SSRF) via the Markdownify.get() function
All versions of the package mcp-markdownify-server are vulnerable to Server-Side Request Forgery (SSRF) via the Markdownify.get() function. An attacker can craft a prompt that, once accessed by the MCP host, can invoke the webpage-to-markdown, bing-search-to-markdown, and youtube-to-markdown tools to issue requests and read the responses to attacker-controlled URLs, potentially leaking sensitive information.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | mcp-markdownify-server | <= 0.0.1 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-5276
- https://github.com/zcaceres/markdownify-mcp/commit/0284aa8f34d32c65e20d8cda2d429b7943c9af03
- https://github.com/zcaceres/markdownify-mcp
- https://github.com/zcaceres/markdownify-mcp/blob/224cf89f0d58616d2a5522f60f184e8391d1c9e3/src/server.ts#L20C17-L20C29
- https://security.snyk.io/vuln/SNYK-JS-MCPMARKDOWNIFYSERVER-10249387
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N- Weakness (CWE)
CWE-918- Platform
- npm
- Package
mcp-markdownify-server- Disclosed
- 29.05.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-frq9-3hp2-xvxg - CC BY 4.0
Vulnerability history: mcp-markdownify-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 05.2025 09.2025
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 2
Disclosures per year
- 2025: 3
- 2026: 0
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Markdownify MCP Server allows Server-Side Request Forgery (SSRF) via the Markdownify.get() function this entry
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