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Low

Langflow has an Information Leak through Incomplete API Key Redaction

  • Disclosed: 20.04.2026
  • Updated: 11.10.2026 14:18

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.

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) langflow <= 1.8.3 no fix

References

CVSS score 2.7/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE)
CWE-256
Platform
Python (PyPI)
Package
langflow
Disclosed
20.04.2026
Updated
11.10.2026 14:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2565 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-5jjf-wcvf-923w - CC BY 4.0

Vulnerability history: langflow

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (42) in the archive
Total entries
42
First → latest
06.2024 10.2026
Without a fix
7
Exploited in attacks
5

Severity breakdown

  • Critical 15
  • High 17
  • Medium 7
  • Low 3

Disclosures per year

Severity:
  1. Langflow: OS command injection (RCE) via arbitrary command in MCP stdio server configuration
    Critical · 9.9 CVE-2026-105697 >= 1.1.2, < 1.10.3 1.10.3
  2. Langflow has Authenticated Cross-Project File Disclosure via Unscoped MCP Resource Handlers
    High CVE-2026-105699 >= 1.6.8, < 1.9.1 1.9.1
  3. Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write
    High · 7.1 CVE-2026-105741 >= 1.5.0, < 1.10.3 1.10.3
  4. Langflow: PythonREPLComponent executes unsandboxed Python code, enabling authenticated RCE and privilege escalation
    Critical · 9.9 CVE-2026-10561 < 1.10.1 1.10.1
  5. Langflow: Weak Fernet Key via random.seed()
    Critical · 9.1 CVE-2026-9205 < 1.10.1 1.10.1
  6. Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
    Critical · 9.8 CVE-2026-8505 >= 1.7.0, < 1.9.1 1.9.1
  7. Langflow: Title Authenticated Remote Code Execution in validate_code via Malicious Decorators Description
    High · 8.8 CVE-2026-51886 >= 1.7.2, < 1.10.1 1.10.1
  8. Langflow: Prompt injection in Langflow Smart Transform can lead to code execution
    High · 8.8 CVE-2026-7700 >= 1.3.0, < 1.10.3 1.10.3
  9. Langflow: BaseFileComponent-based nodes arbitrary file read with RCE exploit
    Critical · 9.6 CVE-2026-55447 < 1.9.2 1.9.2
  10. Langflow: Unauthenticated DoS through multipart form boundary file upload
    High · 7.5 CVE-2026-55446 < 1.0.19 1.0.19
  11. Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow
    High · 8.4 Exploited in attacks CVE-2026-55255 < 1.9.1 1.9.1
  12. Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
    Critical · 9.3 CVE-2026-55450 < 1.9.1 1.9.1
  13. Langflow: Unauthenticated RCE in Shareable Playgrounds
    Critical · 9.6 CVE-2026-48519 < 1.9.2 1.9.2
  14. Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints
    High · 8.8 CVE-2026-33760 < 1.9.0 1.9.0
  15. Langflow Knowledge Bases API is Vulnerable to Path Traversal
    Critical · 9.6 CVE-2026-42048 < 1.9.0 1.9.0
  16. Langflow has an Information Leak through Incomplete API Key Redaction this entry
    Low · 2.7 CVE-2026-6597 <= 1.8.3 no fix
  17. Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership Check
    High CVE-2026-34046 < 1.5.1 1.5.1
  18. Langflow has Authenticated Code Execution in Agentic Assistant Validation
    Critical CVE-2026-33873 < 1.9.0 1.9.0
  19. langflow: /profile_pictures/{folder_name}/{file_name} endpoint file reading
    High CVE-2026-33497 < 1.7.1 1.7.1
  20. langflow has Unauthenticated IDOR on Image Downloads
    High · 7.5 CVE-2026-33484 >= 1.0.0, < 1.9.0 1.9.0
  21. Langflow has an Arbitrary File Write (RCE) via v2 API
    Critical · 9.9 CVE-2026-33309 >= 1.2.0, < 1.9.0 1.9.0
  22. Langflow is Missing Ownership Verification in API Key Deletion (IDOR)
    High CVE-2026-33053 < 1.9.0 1.9.0
  23. Unauthenticated Remote Code Execution in Langflow via Public Flow Build Endpoint
    Critical · 9.8 Exploited in attacks CVE-2026-33017 < 1.9.0 1.9.0
  24. Langflow has Remote Code Execution in CSV Agent
    Critical · 9.8 CVE-2026-27966 <= 1.8.0rc2 no fix
  25. Langflow affected by Remote Code Execution via validate_code() exec()
    High Exploited in attacks CVE-2026-0770 <= 1.7.3 no fix
  26. Langflow Missing Authentication on Critical API Endpoints
    High CVE-2026-21445 < 1.7.1 1.7.1
  27. Langflow vulnerable to Server-Side Request Forgery
    High · 7.7 CVE-2025-68477 < 1.7.1 1.7.1
  28. External Control of File Name or Path in Langflow
    High · 7.1 CVE-2025-68478 < 1.7.1 1.7.1
  29. Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with all
    High · 8.8 Exploited in attacks CVE-2025-34291 < 1.7.0 1.7.0
  30. Langflow Vulnerable to Privilege Escalation via CLI Superuser Creation (Post-RCE)
    High · 8.8 CVE-2025-57760 < 1.5.0 1.5.0
  31. Langflow Unauth RCE
    Critical Exploited in attacks CVE-2025-3248 < 1.3.0 1.3.0
  32. langflow v1.0.12 was discovered to contain a remote code execution (RCE) vulnerability via the PythonCodeTool component.
    Critical · 9.8 CVE-2024-42835 <= 1.0.12 no fix
  33. Langflow through 0.6.19 allows remote code execution if untrusted users are able to reach the "POST /api/v1/custom_component" endpoint and provide a Python script.
    Critical · 9.8 CVE-2024-37014 < 1.0.0a3 1.0.0a3

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