CVE-2026-55450

Name: CVE-2026-55450
Creator: NVD / NIST
Published: 2026-06-23T17:17:08.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10EPSS 0.31%

Last modified Jun 24, 2026

CVE-2026-55450 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

Metrics

CVSS 3.1

9.3/10

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

EPSS Probability

0.31%

22.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Langflow	Langflow	< 1.9.1

References

https://github.com/langflow-ai/langflow/pull/12831Issue Tracking, Patch
https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735Exploit, Patch, Vendor Advisory
https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735Exploit, Patch, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-55450?

How severe is CVE-2026-55450?

CVE-2026-55450 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-55450?

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-2026-55450?

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

Scan your code now

Source: NVD / NIST