---
title: "CVE-2026-46442: FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape"
url: https://erroneo.us/security/cve/CVE-2026-46442/
description: "CVE-2026-46442 (flowise (npm)): Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-08
date_modified: 2026-06-09
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-46442"
kev: false
cvss: 9.4
epss: 0.03414
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-46442: FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 3.4% , percentile 89: FIRST’s model estimates a 3.4% chance of exploitation activity in the next 30 days, higher than 89% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes flowise (npm) <= 3.1.1, fixed in 3.1.2 . Check your lockfile, including transitive dependencies.

## What it is

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2BAPIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via childprocess. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.

## Affected packages

- npm `flowise` <= 3.1.1 → fixed: 3.1.2

## Affected products (CVE record)

- FlowiseAI Flowise: < 3.1.2

## Severity

- GitHub_M CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`
- GitHub CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 3.41% probability of exploitation activity in the next 30 days; percentile 89.

## Sources

- [GitHub Advisory GHSA-9rvc-vf7m-pgm2](https://github.com/advisories/GHSA-9rvc-vf7m-pgm2)
- [CVE.org record CVE-2026-46442](https://www.cve.org/CVERecord?id=CVE-2026-46442)
- [NVD entry CVE-2026-46442](https://nvd.nist.gov/vuln/detail/CVE-2026-46442)
- [github.com](https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2)
- [github.com](https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2)

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Source page: https://erroneo.us/security/cve/CVE-2026-46442/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt