CVE-2026-22218

Chainlit < 2.9.4 Arbitrary File Read via /project/element

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.

Affected

Chainlit

CVSS v4.0 VULNCHECK

7.1 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

9.72% chance of exploitation in the next 30 days, 95th percentile

Published

2026-01-19

Updated

2026-07-14

Proof-of-concept exploits (1)

• https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-da…

Security advisories

• https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-element
• Chainlit/chainlit/releases/tag/2.9.4

References

• CVE Record
• NVD entry