Vulnerability-Lookup

PYSEC-2026-598

Vulnerability from pysec - Published: 2026-01-20 00:15 - Updated: 2026-07-02 07:41

Details

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.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Impacted products

Name	purl
chainlit	pkg:pypi/chainlit

Aliases

CVE-2026-22218

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "chainlit",
        "purl": "pkg:pypi/chainlit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.1",
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        "0.7.500",
        "0.7.501",
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        "0.7.600rc1",
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        "0.7.603",
        "0.7.604",
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        "0.7.604rc1",
        "0.7.604rc2",
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        "1.0.0rc2",
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        "2.9.2",
        "2.9.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-22218"
  ],
  "details": "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\u2019s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.",
  "id": "PYSEC-2026-598",
  "modified": "2026-07-02T07:41:22.724538Z",
  "published": "2026-01-20T00:15:48.910Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/Chainlit/chainlit/releases/tag/2.9.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-element"
    },
    {
      "type": "EVIDENCE",
      "url": "https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-data-enable-cloud-takeover"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-22218 (GCVE-0-2026-22218)

Vulnerability from cvelistv5 – Published: 2026-01-19 23:14 – Updated: 2026-07-14 15:53

Title

Chainlit < 2.9.4 Arbitrary File Read via /project/element

Summary

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

7.1 (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

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-21 19:37 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

VulnCheck mitre root Scorecard

References

3 references

URL	Tags
https://github.com/Chainlit/chainlit/releases/tag/2.9.4	release-notespatch
https://www.zafran.io/resources/chainleak-critica…	technical-descriptionexploit
https://www.vulncheck.com/advisories/chainlit-arb…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Chainlit	Chainlit	Affected: 0 , < 2.9.4 (semver) cpe:2.3:a:chainlit:chainlit::::::::

Credits

Ido Shani and Gal Zaban of Zafran Security

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                "id": "CVE-2026-22218",
                "options": [
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                    "Exploitation": "poc"
                  },
                  {
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-21T19:37:14.195072Z",
                "version": "2.0.3"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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PYSEC-2026-598

CVE-2026-22218 (GCVE-0-2026-22218)

Tags

Sightings

Nomenclature

Related by attack behaviour