How severe is CVE-2026-22218?

CVE-2026-22218 has a CVSS 4.0 base score of 7.1 (HIGH). EPSS estimates a 9.5% probability of exploitation in the next 30 days.

CVE-2026-22218: Chainlit < 2.9.4 Arbitrary File Read via

Q: What is CVE-2026-22218?

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/ , allowing disclosure of any file readable by the Chainlit service.

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.

Severity

CVSS 4.0 · CNA7.1 HIGH

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

SSVC · CISA-ADP

Exploitationpoc

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
Chainlit	Chainlit	0 to <2.9.4

References

3 Links

Patches

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

Exploits & PoCs

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

Third-party advisories

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

Record Details

Published

2026-01-19

Last updated

2026-07-14

Assigner (CNA)

VulnCheck

Credited to

Ido Shani and Gal Zaban of Zafran Security

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CVE-2026-222198.3

Chainlit < 2.9.4 SQLAlchemy Data Layer SSRF via /project/element

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.