MervinPraison PraisonAI/praisonaiagents SseServerTransport mcp_server.py ToolsMCPServer.run_sse dns rebinding

Summaryinfo

A vulnerability has been found in MervinPraison PraisonAI and praisonaiagents and classified as critical. The affected element is the function ToolsMCPServer.run_sse of the file src/praisonai-agents/praisonaiagents/mcp/mcp_server.py of the component SseServerTransport. This manipulation causes dns rebinding. This vulnerability appears as CVE-2026-57112. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in MervinPraison PraisonAI and praisonaiagents (the affected version unknown) and classified as critical. Affected by this vulnerability is the function ToolsMCPServer.run_sse of the file src/praisonai-agents/praisonaiagents/mcp/mcp_server.py of the component SseServerTransport. The manipulation with an unknown input leads to a dns rebinding vulnerability. The CWE definition for the vulnerability is CWE-350. The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-57112 since 06/24/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/15/2026). MITRE ATT&CK project uses the attack technique T1583.002 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• MervinPraison

Name

• PraisonAI
• praisonaiagents

Website

• Product: https://github.com/MervinPraison/PraisonAI/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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