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Chainlit MCP module vulnerable to RCE and SSRF

By PulseAugur Editorial · [1 sources] ·

Two critical vulnerabilities, CVE-2026-45018 and CVE-2026-45019, have been discovered in Chainlit's MCP module, affecting versions prior to 2.12.0. CVE-2026-45018 allows for unauthenticated remote code execution through the MCP stdio transport by exploiting improper validation of client-supplied commands. CVE-2026-45019 enables unauthenticated server-side request forgery (SSRF) via SSE and streamable-http, allowing attackers to make arbitrary HTTP requests from the server. Both vulnerabilities require the MCP feature to be enabled, which is off by default since version 2.7.0. AI

IMPACT Security patches for development tools like Chainlit are crucial for maintaining the integrity of AI application development pipelines.

RANK_REASON This is a security vulnerability disclosure for a specific software tool, not a frontier model release or significant industry event.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Chainlit MCP module vulnerable to RCE and SSRF

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40 / 100
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This is a security vulnerability disclosure for a specific software tool, not a frontier model release or significant industry event.
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Michael Kantor ·

    CVE-2026-45018: Chainlit MCP stdio unauthenticated RCE (and sibling CVE-2026-45019)

    <p><em>Originally published at <a href="https://hol.org/blog/cve-2026-45018-chainlit-mcp-stdio-unauth-rce-2" rel="noopener noreferrer">HOL</a></em></p> <h1> CVE-2026-45018: Chainlit MCP stdio unauthenticated RCE </h1> <p>Chainlit 2.12.0 (2026-08-25) closes two bugs on <code>/mcp<…

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