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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

LangChain prompt-template validation flaw and LangChain-ChatChat MCP RCE disclosed

Two vulnerabilities were disclosed in the LangChain ecosystem: incomplete f-string prompt-template validation in LangChain (CVE-2026-40087) allowed attribute-access and nested replacement-field expressions to be evaluated during formatting, fixed in langchain-core 0.3.84 and 1.2.28; and LangChain-ChatChat 0.3.1 (CVE-2026-30617) allowed a remote attacker to configure an MCP STDIO server via an exposed management interface and execute arbitrary commands when agents run.

Disclosed 9 April 2026 · Record updated 13 September 2026

Impact

Unsafe evaluation of expressions in prompt templates in LangChain prior to 0.3.84/1.2.28, and arbitrary command execution within the context of the LangChain-ChatChat 0.3.1 service via attacker-configured MCP STDIO servers.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-40087
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-30617