CVE-2026-22218

Medium

Description

Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/<chainlitKey>, allowing disclosure of any file readable by the Chainlit service.

SeverityMedium

CVSS6.5

Exploit probability—

ProductChainlit

PublishedJan 20, 2026

First seenJan 20, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

chainlit chainlit2.9.4 or later
chainlit2.9.4 or later

Patches

github.com/Chainlit/chainlit/releases/tag/2.9.4

Affected products

Product	Affected versions	Fixed in
chainlit chainlit	v < 2.9.4	2.9.4
chainlitPyPI	v < 2.9.4	2.9.4

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