Vulnerability record · CVE-2026-55450 · published 23 June 2026

CVE-2026-55450: Langflow information exposure vulnerability

Langflow · Langflow

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.

9.3 CVSS 3.1 Critical EPSS 1.2% · top 33.3% CWE-200 · Information exposureCWE-306 · Missing authentication for critical function

9.3CVSS 3.1 base score

1.2%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References, 2 tagged exploit

24 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Langflow Langflow

References

Link	Tags
https://github.com/langflow-ai/langflow/pull/12831	Issue TrackingPatch
https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735	ExploitPatchVendor Advisory
https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735	ExploitPatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-55450), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.