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Vulnerabilities

Vulnerability · CVE-2026-22218

Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow.

Published Jan 19, 2026 · catalog updated Jul 14, 2026 · Chainlit Chainlit

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-22218. EPSS is 9.72%. Act only if a listed version of Chainlit Chainlit is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
9.72%
Remediation
Version ranges on file
Affected products
vendor Chainlit Chainlit 0 <2.9.4

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Chainlit Chainlit 0 <2.9.40 <2.9.4

How to fix CVE-2026-22218

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-22218. EPSS is 9.72%. Act only if a listed version of Chainlit Chainlit is installed.

Which versions are affected?

Compare what you have installed with Chainlit Chainlit 0 <2.9.4 0 <2.9.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 9.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 19, 2026 · EUVD

    Detected

    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

  2. Jul 14, 2026 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-22218

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-22218

    30-day exploitation probability 9.72%

    first.org
  • EUVDVulnerability recordEUVD-2026-3345

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026