CVE-2026-22218
Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (9.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 4.0
- 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/M
- EPSS
- 9.38% probability · 95th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- chainlit/chainlit
- Source
- disclosure@vulncheck.com
References
- https://github.com/Chainlit/chainlit/releases/tag/2.9.4Product, Release Notes
- https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-elementThird Party Advisory
- https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-data-enable-cloud-takeoverExploit, Mitigation, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.