Detections
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Langflow < 1.9.0 RCE (GHSA-vwmf-pq79-vjvx)

critical Nessus Plugin ID 303795

Synopsis

The remote host is affected by a remote code execution vulnerability.

Description

The version of Langflow installed on the remote host is prior to 1.9.0. It is, therefore, affected by a remote code execution vulnerability:

 - The POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data containing arbitrary Python code in node definitions instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution.
 (CVE-2026-33017)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Langflow version 1.9.0 or later.

See Also

http://www.nessus.org/u?44d0b003

Plugin Details

Severity: Critical

ID: 303795

File Name: langflow_CVE-2026-33017.nasl

Version: 1.1

Type: local

Agent: windows, macosx, unix

Published: 3/26/2026

Updated: 3/26/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-33017

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Vulnerability Information

CPE: cpe:/a:langflow:langflow

Required KB Items: installed_sw/Langflow

Patch Publication Date: 3/16/2026

Vulnerability Publication Date: 3/16/2026

Reference Information

CVE: CVE-2026-33017