High 8.3Published Sep 15, 2026

CVE-2026-57112PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects MervinPraison PraisonAI and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for MervinPraison PraisonAI

Exploited in the last 30 days

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.

CVSS: 8.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-306, CWE-346, CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

MervinPraison PraisonAI mervinpraison:praisonai (from the name)	from 3.10.0, < 4.6.59	CNA record
MervinPraison praisonaiagents mervinpraison:praisonaiagents (from the name)	from 0.6.0, < 1.6.59	CNA record

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-vmf9-xx9w-86wxx-refsource-confirm
https://github.com/MervinPraison/PraisonAI/commit/2adfe7e8323f6deec66925cf15a885b6238895e9x-refsource-misc
https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.59x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.