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CVE-2026-45018 is a critical OS command-injection vulnerability in Chainlit versions 2.4.0rc0 through 2.11.x. When MCP is enabled, an unauthenticated MCP connection could supply a complete command string for a stdio-backed server. Chainlit parsed the command but validated only the executable basename against the configured executable allowlist; all subsequent arguments were passed unchecked to subprocess creation. An omitted allowlist was interpreted as permitting all local executables. Even with an allowlist, dual-use programs such as npx could be invoked with command-execution arguments, resulting in arbitrary shell-command execution. Chainlit 2.12.0 removes client control of stdio command strings and instead requires server-side declaration of MCP servers.
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A critical unauthenticated command-injection vulnerability in Chainlit's MCP stdio transport. In vulnerable deployments, validation checks only the executable name and permits unchecked arguments; use of npx with its -c argument enables arbitrary shell-command execution as the Chainlit process. An unset allowed_executables configuration permits every executable.
A critical unauthenticated remote command-execution vulnerability in Chainlit's MCP stdio transport. The flawed executable allowlist ignored command arguments and defaulted to permit-all when no allowlist was configured, enabling arbitrary local binary execution; npx command-execution flags could bypass a configured binary-only allowlist.
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Cross-references every affected SKU, including bundled OEM variants.
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