CVE-2026-6597: Langflow Langflow Has An Information Leak Vulnerability

LOW
Advisory Identifier: GHSA-5jjf-wcvf-923w
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CVSS 2.7
CWE-256
Published
Advisory Summary

CVE-2026-6597 is a LOW (CVSS 2.7) langflow has an information leak vulnerability (CWE-256: Plaintext Storage of a Password) affecting Langflow libraries in the PyPI ecosystem. The issue involves langflow has an information leak through incomplete api key redaction. Remediation is available in the latest vendor maintenance releases.

CVE-2026-6597 at a Glance

CVE Identifier CVE-2026-6597
GHSA Identifier GHSA-5jjf-wcvf-923w
Severity LOW
CVSS v3.1 Base Score 2.7
CWE Classification CWE-256: Plaintext Storage of a Password
Affected Product Langflow
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 2.7

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
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-2026-6597

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: Latest secure release 
pip install langflow>=Latest secure release
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-2026-6597, 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 the patched release), 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-256: Plaintext Storage of a Password, where the product stores a password in plaintext within resources such as memory or files. 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 weakness has been identified in langflow-ai langflow up to 1.8.3. Impacted is the function remove_api_keys/has_api_terms of the file src/backend/base/langflow/api/utils/core.py of the component Flow Using API. This manipulation causes unprotected storage of credentials. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-6597 Affected Langflow Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
langflow
pypi/langflow
PyPI
≤ 1.8.3

References

NVD — CVE-2026-6597 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6597
Langflow Source Repository REPOSITORY
https://gist.github.com/chenhouser2025/b93261c6e651f14800a4f2e4365f357b
Langflow Source Repository REPOSITORY
https://github.com/langflow-ai/langflow
vuldb.com/submit/791920 WEB
https://vuldb.com/submit/791920
vuldb.com/vuln/358232 WEB
https://vuldb.com/vuln/358232
vuldb.com/vuln/358232/cti WEB
https://vuldb.com/vuln/358232/cti

Frequently Asked Questions

What is CVE-2026-6597?
CVE-2026-6597 is a security vulnerability in Langflow involving Langflow has an Information Leak through Incomplete API Key Redaction under CWE-256: Plaintext Storage of a Password.
Which Langflow versions are affected?
Affected versions include releases prior to current release patches across affected packages: langflow.
What version fixes CVE-2026-6597?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is langflow affected?
Yes, langflow is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-6597?
CVE-2026-6597 has a CVSS v3.1 base score of 2.7 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-6597?
CVE-2026-6597 is classified under CWE-256: Plaintext Storage of a Password (The product stores a password in plaintext within resources such as memory or files.).
How can I check PyPI dependencies for CVE-2026-6597?
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 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5jjf-wcvf-923w",
  "modified" : "2026-04-24T20:22:08Z",
  "published" : "2026-04-20T03:34:42Z",
  "aliases" : [ "CVE-2026-6597" ],
  "summary" : "Langflow has an Information Leak through Incomplete API Key Redaction",
  "details" : "A weakness has been identified in langflow-ai langflow up to 1.8.3. Impacted is the function remove_api_keys/has_api_terms of the file src/backend/base/langflow/api/utils/core.py of the component Flow Using API. This manipulation causes unprotected storage of credentials. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "langflow"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.8.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-6597"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/chenhouser2025/b93261c6e651f14800a4f2e4365f357b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/langflow-ai/langflow"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/791920"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/358232"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/358232/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-256" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-24T20:20:33Z",
    "nvd_published_at" : "2026-04-20T03:16:17Z"
  }
}