CVE-2026-55446

Name: CVE-2026-55446
Creator: NVD / NIST
Published: 2026-06-23T17:17:08.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.32%

Last modified Jun 24, 2026

CVE-2026-55446 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.32%

23.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Langflow	Langflow	< 1.0.19

References

https://github.com/langflow-ai/langflow/pull/3923Issue Tracking, Patch
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9Exploit, Patch, Vendor Advisory
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9Exploit, Patch, Vendor Advisory

Timeline

Published: Jun 23, 2026
Last Modified: Jun 24, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-55446?

How severe is CVE-2026-55446?

CVE-2026-55446 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2026-55446?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-55446?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST