CVE-2026-57112
Received Received - Intake

ToolsMCPServer DNS Rebinding in PraisonAI Agents

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: GitHub, Inc.

Description
PraisonAI is a multi-agent teams system. From praisonaiagents 0.6.0 until 1.6.59 and PraisonAI 3.10.0 until 4.6.59, ToolsMCPServer.run_sse() in src/praisonai-agents/praisonaiagents/mcp/mcp_server.py mounts SseServerTransport on the legacy /sse and /messages/ endpoints without default Host, Origin, or authentication enforcement. A malicious website can use DNS rebinding against a reachable local or internal SSE server, supply attacker-controlled Host and Origin headers, enumerate registered tools, and invoke them with the server user's privileges. The Streamable HTTP transport rejects the same hostile Origin, which isolates the flaw to the legacy SSE wrapper. An initial remediation was released in praisonaiagents 1.6.59 and PraisonAI 4.6.59.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-57112
EUVD
EUVD-2026-78424

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
praisonai praisonaiagents From 0.6.0 (inc) to 1.6.59 (inc)
praisonai praisonai From 3.10.0 (inc) to 4.6.59 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-346 The product does not properly verify that the source of data or communication is valid.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

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Executive Summary

CVE-2026-57112 is a high-severity vulnerability in PraisonAI's ToolsMCPServer legacy SSE transport. The ToolsMCPServer.run_sse() function creates a Starlette MCP HTTP+SSE server without validating Host, Origin headers, or requiring authentication for the /sse and /messages/ endpoints. This allows DNS rebinding attacks where a malicious website sends requests with attacker-controlled headers to a locally or internally running PraisonAI SSE MCP server.

Detection Guidance

To detect this vulnerability, check if PraisonAI versions 3.10.0 to 4.6.58 or praisonaiagents versions 0.6.0 to 1.6.58 are running. Inspect network traffic for requests to /sse or /messages/ endpoints without authentication or origin validation. Use commands like 'curl http://localhost:port/sse' to test endpoint accessibility.

Impact Analysis

An attacker can exploit this to list and invoke registered tools, potentially accessing local files, repositories, cloud APIs, or internal services. This could lead to confidentiality, integrity, and availability impacts. Exploitation requires DNS rebinding or equivalent browser setup but can be performed without user credentials.

Mitigation Strategies

Immediately upgrade to praisonaiagents 1.6.59+ or PraisonAI 4.6.59+. If upgrading is not possible, disable the legacy SSE transport by removing /sse and /messages/ endpoints. Add authentication via MCP_SSE_AUTH_TOKEN and validate origins using MCP_SSE_ALLOWED_ORIGINS.

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