CVE-2026-81092

A flaw was found in mcp-go. This component failed to validate the Host header in HTTP requests, specifically within its StreamableHTTPServer and SSEServer transports. A remote attacker could exploit this by using a crafted web page to perform a DNS rebinding attack. This allows the attacker to...

PT-2026-82565

Name of the Vulnerable Software and Affected Versions mcp-go versions prior to 0.56.0 Description The software accepts requests on its HTTP transports without validating the Host header. Specifically, the StreamableHTTPServer.ServeHTTP function in server/streamable http.go and the...

github.com/mark3labs/mcp-go: mcp-go: DNS Rebinding vulnerability due to missing Host header validation

A flaw was found in mcp-go. This component failed to validate the Host header in HTTP requests, specifically within its StreamableHTTPServer and SSEServer transports. A remote attacker could exploit this by using a crafted web page to perform a DNS rebinding attack. This allows the attacker to...