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CVE-2026-22218— Chainlit < 2.9.4 Arbitrary File Read via /project/element

Quick assessment

Affected
Chainlit Chainlit
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Chainlit是chainlit开源的一个大模型对话界面框架。 Chainlit 2.9.4之前版本存在路径遍历漏洞，该漏洞源于对/project/element更新流程中路径参数处理不当，可能导致任意文件读取。

AI Predicted 7.5 Difficulty: Easy EPSS 9.72% · P96

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
Chainlit Chainlit < 2.9.4 affected
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I. Basic Information for CVE-2026-22218

Vulnerability Information
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Vulnerability Title
Chainlit < 2.9.4 Arbitrary File Read via /project/element
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Chainlit 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chainlit是chainlit开源的一个大模型对话界面框架。 Chainlit 2.9.4之前版本存在路径遍历漏洞，该漏洞源于对/project/element更新流程中路径参数处理不当，可能导致任意文件读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Chainlit Chainlit 0 ~ 2.9.4 -

II. Public POCs for CVE-2026-22218

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III. Intelligence Information for CVE-2026-22218

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IV. Related Vulnerabilities

Same product: Chainlit
Same vendor: Chainlit
Same weakness: CWE-22