Vulnerability Description
mcp-searxng is a Model Context Protocol server that gives AI assistants web search and URL-reading capabilities through SearXNG. Prior to 1.2.0, the web_url_read URL policy in src/url-reader.ts can be bypassed while MCP_HTTP_HARDEN is enabled and MCP_HTTP_ALLOW_PRIVATE_URLS is not enabled because redirect targets are not revalidated, 0.0.0.0 is not classified as an internal address, and IPv4-mapped IPv6 literals canonicalized to hexadecimal form are not recognized. These inputs allow an attacker-influenced tool call to make the MCP server fetch loopback or internal HTTP resources and return content from local services, private APIs, service-mesh endpoints, or cloud metadata endpoints. The separate hostname-to-private-address case addressed by the earlier partial fix is not part of these residual bypasses. This issue is fixed in version 1.2.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/ihor-sokoliuk/mcp-searxng/commit/48e5ecdcb4166a60b94c252dbe74
- https://github.com/ihor-sokoliuk/mcp-searxng/pull/79
- https://github.com/ihor-sokoliuk/mcp-searxng/releases/tag/v1.2.0
- https://github.com/ihor-sokoliuk/mcp-searxng/security/advisories/GHSA-wppf-h75h-
- https://github.com/ihor-sokoliuk/mcp-searxng/security/advisories/GHSA-wppf-h75h-
FAQ
What is CVE-2026-54689?
CVE-2026-54689 is a vulnerability with a CVSS score of 6.3 (MEDIUM). mcp-searxng is a Model Context Protocol server that gives AI assistants web search and URL-reading capabilities through SearXNG. Prior to 1.2.0, the web_url_read URL policy in src/url-reader.ts can be...
How severe is CVE-2026-54689?
CVE-2026-54689 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54689?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.