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CVE-2026-119978— Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore

Quick assessment

Affected
FlowiseAI Flowise
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.

Flowise 3.1.4 及之前版本存在沙箱逃逸漏洞。当配置项 设置为 时，已认证用户可通过滥用白名单中的 langchain 和 mammoth 模块，执行操作系统命令。攻击者可向 接口提交 JavaScript 代码，利用 LocalFileStore 将文件写入 mammoth 包目录，随后通过 require 加载该文件，从而以 Flowise 进程所属用户身份突破 vm2 沙箱限制。

CVSS 8.5 · High EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
FlowiseAI Flowise ≤ 3.1.4 affected
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I. Basic Information for CVE-2026-119978

Vulnerability Information
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Vulnerability Title
Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise through 3.1.4 contains a sandbox escape vulnerability that allows authenticated users to execute OS commands by abusing allowlisted langchain and mammoth modules when ALLOW_BUILTIN_DEP=true. Attackers can submit JavaScript to /api/v1/node-custom-function that writes a file into the mammoth package via LocalFileStore and requires it, escaping vm2 as the Flowise process user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FlowiseAI Flowise 0 ~ 3.1.4 -

II. Public POCs for CVE-2026-119978

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-119978

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Vendor Advisories for CVE-2026-119978 (2)

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: FlowiseAI
Same weakness: CWE-749