CVE-2026-45018criticalCWE-78

CVE-2026-45018: falha crítica em chainlit

Chainlit: Command injection via MCP stdio transport allows unauthenticated remote code execution

Publicada em

Seguir esta CVE+ Monitorar chainlit+ Monitorar chainlit

Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.

28Vexday Risk Score

Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.

ssvc Trackcvss 9.8epss 1.1%
Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For stdio transport, the endpoint accepts a user-controlled fullCommand string. The validate_mcp_command() function in backend/chainlit/mcp.py checks only the executable name against config.features.mcp.stdio.allowed_executables and passes unchecked arguments to StdioServerParameters in backend/chainlit/server.py. Because npx supports the -c argument, an attacker can execute arbitrary shell commands with the privileges of the Chainlit process. If allowed_executables is unset, its None default is treated as allowing every executable. This issue is fixed in version 2.12.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Produtos afetados
Chainlit · chainlit
CVEs relacionadas — chainlit

No mesmo produto, das mais perigosas para as menos.

CVE-2026-86099HIGHChainlit through 2.12.0 Path Traversal via socket.io sessionIdEPSS 0.6%CVE-2026-45019HIGHChainlit: SSRF via MCP SSE and streamable-http transports allows unauthenticated internal network accessEPSS 0.4%CVE-2026-56104HIGHChainlit < 2.10.1 Session Hijacking via WebSocket Session RestorationEPSS 0.4%CVE-2026-82290MEDIUMChainlit Feedback Endpoints Missing Ownership ValidationEPSS 0.3%