Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chainlit | Chainlit | < 2.9.4 |
Related Weaknesses (CWE)
References
- https://github.com/Chainlit/chainlit/releases/tag/2.9.4ProductRelease Notes
- https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-elThird Party Advisory
- https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-ExploitMitigationThird Party Advisory
FAQ
What is CVE-2026-22218?
CVE-2026-22218 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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, ...
How severe is CVE-2026-22218?
CVE-2026-22218 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-22218?
Check the references section above for vendor advisories and patch information. Affected products include: Chainlit Chainlit.