CVE-2026-22218

high

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.

References

https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-data-enable-cloud-takeover

https://www.bleepingcomputer.com/news/security/chainlit-ai-framework-bugs-let-hackers-breach-cloud-environments/

https://thehackernews.com/2026/01/chainlit-ai-framework-flaws-enable-data.html

https://www.theregister.com/2026/01/20/ai_framework_flaws_enterprise_clouds/

https://www.securityweek.com/chainlit-vulnerabilities-may-leak-sensitive-information/

https://www.infosecurity-magazine.com/news/chainlit-security-flaws-ai-apps/

https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-element

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

Details

Source: Mitre, NVD

Published: 2026-01-20

Updated: 2026-01-26

Named Vulnerability: ChainLeak

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Severity: High

CVSS v4

Base Score: 7.1

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00026