CVE-2026-86099: fallo de gravedad alta en chainlit
Chainlit through 2.12.0 Path Traversal via socket.io sessionId
Publicada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.8epss 0.6%
Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and recursively delete arbitrary directories accessible to the service process.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Productos afectados
Chainlit · chainlitCVEs relacionadas — chainlit
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-45018CRITICALChainlit: Command injection via MCP stdio transport allows unauthenticated remote code executionEPSS 1.1%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%
Referencias
https://github.com/Chainlit/chainlithttps://github.com/Chainlit/chainlit/blob/2.12.0/backend/chainlit/session.pyhttps://github.com/Chainlit/chainlit/blob/2.12.0/backend/chainlit/socket.pyhttps://pypi.org/project/chainlit/https://www.vulncheck.com/advisories/chainlit-through-2.12.0-path-traversal-via-socket-io-sessionid