CVE-2026-86099 — Chainlit through 2.12.0 Path Traversal via socket.io sessionId
Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolut…
Published: 2026-09-09 · CVSS: 8.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7