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Medium

Inefficient Regular Expression Complexity in langflow

  • Disclosed: 27.09.2024
  • Updated: 11.10.2026 13:18

A vulnerability classified as problematic was found in Langflow up to 1.0.18. Affected by this vulnerability is an unknown functionality of the file \src\backend\base\langflow\interface\utils.py of the component HTTP POST Request Handler. The manipulation of the argument remaining_text leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. 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 <= 1.0.18 no fix

References

CVSS score 3.5/10
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE)
CWE-1333
Platform
Python (PyPI)
Package
langflow
Disclosed
27.09.2024
Updated
11.10.2026 13:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-1521 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-355v-2rjx-fpx7 - 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. Inefficient Regular Expression Complexity in langflow this entry
    Medium · 3.5 CVE-2024-9277 <= 1.0.18 no fix
  2. 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
  3. 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
  4. 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
  5. Langflow: PythonREPLComponent executes unsandboxed Python code, enabling authenticated RCE and privilege escalation
    Critical · 9.9 CVE-2026-10561 < 1.10.1 1.10.1
  6. Langflow: Weak Fernet Key via random.seed()
    Critical · 9.1 CVE-2026-9205 < 1.10.1 1.10.1
  7. Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
    Critical · 9.8 CVE-2026-8505 >= 1.7.0, < 1.9.1 1.9.1
  8. 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
  9. 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
  10. Langflow: BaseFileComponent-based nodes arbitrary file read with RCE exploit
    Critical · 9.6 CVE-2026-55447 < 1.9.2 1.9.2
  11. Langflow: Unauthenticated DoS through multipart form boundary file upload
    High · 7.5 CVE-2026-55446 < 1.0.19 1.0.19
  12. 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
  13. Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
    Critical · 9.3 CVE-2026-55450 < 1.9.1 1.9.1
  14. Langflow: Unauthenticated RCE in Shareable Playgrounds
    Critical · 9.6 CVE-2026-48519 < 1.9.2 1.9.2
  15. Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints
    High · 8.8 CVE-2026-33760 < 1.9.0 1.9.0
  16. Langflow Knowledge Bases API is Vulnerable to Path Traversal
    Critical · 9.6 CVE-2026-42048 < 1.9.0 1.9.0
  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
Show more (12) Showing 21 of 33

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