PT-2026-89000 · Chainlit · Chainlit

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CVE-2026-86099

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Published

2026-09-09

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Updated

2026-09-09

CVSS v3.1

8.2

High

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
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.

Fix

Path traversal

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Weakness Enumeration

Related Identifiers

CVE-2026-86099

Affected Products

Chainlit