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Langflow < 1.0.19 DoS (CVE-2026-55446)

high Nessus Plugin ID 326240

Synopsis

The remote host is affected by a denial of service vulnerability.

Description

The version of Langflow installed on the remote host is prior to 1.0.19. It is, therefore, affected by a denial of service vulnerability:

 - An attacker can send a /api/v1/files/upload/ request without any authentication and abuse a very long multipart form boundary to make the Langflow application unusable for all users for an indefinite amount of time. (CVE-2026-55446)

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 1.0.19 or later.

See Also

http://www.nessus.org/u?c673d61e

Plugin Details

Severity: High

ID: 326240

File Name: langflow_CVE-2026-55446.nasl

Version: 1.1

Type: Combined

Agent: windows, macosx, unix

Published: 7/10/2026

Updated: 7/10/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.19

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-55446

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:langflow:langflow

Required KB Items: installed_sw/Langflow

Patch Publication Date: 10/10/2024

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-55446