CVE-2026-55446 | Langflow is a tool for building and deploying AI-powered age… | CVSS 7.5 HIGH

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.

Metadata

CVE ID: CVE-2026-55446
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 21:59 UTC
Published: 2026-06-23 16:26 UTC
Last updated: 2026-06-23 17:56 UTC
Primary CWE: CWE-400
CWE-400: Uncontrolled Resource Consumption
Vendor / Product: langflow-ai / langflow
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
langflow-ai	langflow	—	< 1.0.19

Weakness (CWE)

CWE	Source	Description
CWE-400	cna	CWE-400: Uncontrolled Resource Consumption

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (2)

https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9
https://github.com/langflow-ai/langflow/pull/3923 https://github.com/langflow-ai/langflow/pull/3923