CVE-2026-6598: Langflow Cleartext Storage Of Authentication Settings Vulnerability

LOW
Advisory Identifier: GHSA-9jpj-cph8-w449
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CVSS 4.3
CWE-312 CWE-313
Published
Advisory Summary

CVE-2026-6598 is a LOW (CVSS 4.3) cleartext storage of authentication settings vulnerability (CWE-312: Cleartext Storage of Sensitive Information) affecting Langflow libraries in the PyPI ecosystem. The issue involves cleartext storage of authentication settings in project creation endpoint. Remediation is available by upgrading affected packages to version 1.9.1.

CVE-2026-6598 at a Glance

CVE Identifier CVE-2026-6598
GHSA Identifier GHSA-9jpj-cph8-w449
Severity LOW
CVSS v3.1 Base Score 4.3
CWE Classification CWE-312: Cleartext Storage of Sensitive Information
Affected Product Langflow
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-6598

To remediate this vulnerability, upgrade all affected Langflow dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

langflow fixed: 1.9.1 
pip install langflow>=1.9.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show langflow

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-6598, inspect your installed packages using pip:

pip show langflow

Analyze the terminal output to locate any version of Langflow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.9.1), your application is affected.

Note: The pip show langflow command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-312: Cleartext Storage of Sensitive Information, where the product stores sensitive information in cleartext within a resource that might be accessible to another control sphere. In Langflow, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A security vulnerability has been detected in langflow-ai langflow up to 1.8.3. The affected element is the function create_project/encrypt_auth_settings of the file src/backend/base/Langflow/api/v1/projects.py of the component Project Creation Endpoint. Such manipulation of the argument auth_settings leads to cleartext storage in a file or on disk. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-6598 Affected Langflow Versions

1 component(s)
Fixed Versions:
1.9.1
Product / Package Ecosystem Affected Versions Fixed Version
langflow
pypi/langflow
PyPI
< 1.9.1
1.9.1

References

NVD — CVE-2026-6598 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6598
Security Fix Commit FIX COMMIT
https://github.com/langflow-ai/langflow/commit/45325f6376309a91f5017fa033a96c09c7e295e3
Langflow Source Repository REPOSITORY
https://gist.github.com/chenhouser2025/77adb3486c06c635ae4b09a3eaf90213
Langflow Source Repository REPOSITORY
https://github.com/langflow-ai/langflow
vuldb.com/submit/791921 WEB
https://vuldb.com/submit/791921
vuldb.com/vuln/358233 WEB
https://vuldb.com/vuln/358233
vuldb.com/vuln/358233/cti WEB
https://vuldb.com/vuln/358233/cti

Frequently Asked Questions

What is CVE-2026-6598?
CVE-2026-6598 is a security vulnerability in Langflow involving Cleartext Storage of Authentication Settings in Project Creation Endpoint under CWE-312: Cleartext Storage of Sensitive Information.
Which Langflow versions are affected?
Affected versions include releases prior to 1.9.1 across affected packages: langflow.
What version fixes CVE-2026-6598?
Upgrading to 1.9.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is langflow affected?
Yes, langflow is affected in releases prior to 1.9.1. Upgrade your dependency to 1.9.1 or later.
What is the CVSS score of CVE-2026-6598?
CVE-2026-6598 has a CVSS v3.1 base score of 4.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-6598?
CVE-2026-6598 is classified under CWE-312: Cleartext Storage of Sensitive Information (The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.).
How can I check PyPI dependencies for CVE-2026-6598?
Run the dependency tree command: 'pip show langflow'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-9jpj-cph8-w449",
  "modified" : "2026-04-24T20:35:01Z",
  "published" : "2026-04-20T06:31:27Z",
  "aliases" : [ "CVE-2026-6598" ],
  "summary" : "Langflow: Cleartext Storage of Authentication Settings in Project Creation Endpoint",
  "details" : "A security vulnerability has been detected in langflow-ai langflow up to 1.8.3. The affected element is the function create_project/encrypt_auth_settings of the file src/backend/base/Langflow/api/v1/projects.py of the component Project Creation Endpoint. Such manipulation of the argument auth_settings leads to cleartext storage in a file or on disk. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.",
  "severity" : [ {
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    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
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  "references" : [ {
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  }, {
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    "type" : "WEB",
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  "database_specific" : {
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    "nvd_published_at" : "2026-04-20T04:16:52Z"
  }
}