CriticalVulnerability

CVE-2026-30617: LangChain-ChatChat remote code execution through MCP STDIO server configuration

Source: NVD(opens in a new tab)
Identifier: CVE-2026-30617
Published: April 15, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.7%

Summary

LangChain-ChatChat 0.3.1 contains a remote code execution flaw in its MCP STDIO server configuration and execution handling. A remote attacker who can reach the publicly exposed MCP management interface can configure an MCP STDIO server with attacker-controlled commands and arguments, and once the server starts with MCP enabled for agent execution, arbitrary commands run within the context of the LangChain-ChatChat service.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

EPSS: 0.7%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 15, 2026.
Disclosure date: April 15, 2026

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Agent
Impact: Confidentiality,
Integrity,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-30617

First tracked: April 15, 2026 at 02:09 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 93% (self-assessed)

Topics

Model Context Protocol

Summary

Mitigation

Topics

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