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CVE-2026-57112 is a DNS rebinding vulnerability in the legacy Server-Sent Events (SSE) MCP server transport used by PraisonAI. The vulnerable implementation accepts attacker-controlled Host and Origin headers without authentication or adequate origin validation, allowing a malicious web origin to reach a locally exposed or internally reachable MCP server. Through DNS rebinding, an attacker can cause a victim's browser to communicate with the legacy SSE endpoints and interact with registered MCP tools as the local user. The issue affects the legacy SSE transport path and stems from missing or insufficient validation of trusted origins and hosts on the relevant HTTP endpoints.
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