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CVE-2026-44287— FastGPT: sandbox escape to RCE - code-sandbox regex /\bimport\s*\(/ is bypassable

Quick assessment

Affected
labring FastGPT
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FastGPT是labring开源的一款基于大语言模型的开源知识库问答系统。 FastGPT 4.15.0-beta1之前版本存在安全漏洞，该漏洞源于JavaScript沙箱工作器使用正则表达式/imports(/测试动态import()，但JavaScript语法允许在import和(之间使用块注释，导致有效载荷import//(child_process )绕过检测并执行任意命令。

CVSS 6.3 · Medium EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
labring FastGPT < 4.15.0-beta1 affected
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I. Basic Information for CVE-2026-44287

Vulnerability Information
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Vulnerability Title
FastGPT: sandbox escape to RCE - code-sandbox regex /\bimport\s*\(/ is bypassable
Source: CVE Program / CVE List V5
Vulnerability Description
FastGPT is an AI Agent building platform. Prior to 4.15.0-beta1, the JavaScript sandbox worker at projects/code-sandbox/src/pool/worker.ts:356 blocks dynamic import() with the regex /\bimport\s*\(/.test(code). JavaScript syntax accepts a block comment between import and (; the regex matches only ASCII whitespace, and the bytes /, *, *, / are not in the \s character class. The payload import/**/("child_process") parses as a syntactically valid dynamic import that the regex does not detect. Because import() is not wrapped by the safeRequire Proxy (which only proxies require), the attacker loads child_process and calls execSync - arbitrary command execution as uid=100(sandbox) inside the sandbox container. This vulnerability is fixed in 4.15.0-beta1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FastGPT 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastGPT是labring开源的一款基于大语言模型的开源知识库问答系统。 FastGPT 4.15.0-beta1之前版本存在安全漏洞，该漏洞源于JavaScript沙箱工作器使用正则表达式/imports*(/测试动态import()，但JavaScript语法允许在import和(之间使用块注释，导致有效载荷import/**/(child_process )绕过检测并执行任意命令。
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
labring FastGPT < 4.15.0-beta1 -

II. Public POCs for CVE-2026-44287

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III. Intelligence Information for CVE-2026-44287

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Vendor Advisories for CVE-2026-44287 (1)

IV. Related Vulnerabilities

Same product: FastGPT
Same vendor: labring
Same weakness: CWE-94

V. Comments for CVE-2026-44287

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