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Medium

Langflow: Unauthenticated Shareable Playground arbitrary local or S3 file read

  • Disclosed: 16.06.2026
  • Updated: 11.10.2026 14:18

Summary

The "Shareable Playground" (or "Public Flows" in code) contains a potential arbitrary file-read vulnerability, depending on the exact flow configuration used.

By making a flow public, public execution of the flow is allowed. The execution request can contain a list of files that gets read by Langflow and fed into the LLM. The files path can be any path supported by the storage - it can be either a local file or S3 path if supported by the local configuration

Details

Shareable Playground feature works by enabling the execution of workflows by unauthenticated users, by accessing a link. Specifically, it enables the route /api/v1/build_public_tmp to execute any public flow, given a public flow ID. This request contains a files field that can contain a list of files. The files get read in LCModelComponent._get_chat_result in a call to to_lc_message. A detailed stacktrace:

python
...
  File "/Users/ori/Work/research/langchain/langflow/src/backend/base/langflow/api/build.py", line 466, in build_vertices
    vertex_build_response: VertexBuildResponse = await _build_vertex(vertex_id, graph, event_manager)
  File "/Users/ori/Work/research/langchain/langflow/src/backend/base/langflow/api/build.py", line 324, in _build_vertex
    vertex_build_result = await graph.build_vertex(
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/graph/graph/base.py", line 1563, in build_vertex
    await vertex.build(
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/graph/vertex/base.py", line 770, in build
    await step(user_id=user_id, event_manager=event_manager, **kwargs)
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/events/observability/lifecycle_events.py", line 95, in wrapper
    result = await observed_method(self, *args, **kwargs)
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/graph/vertex/base.py", line 411, in _build
    await self._build_results(
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/graph/vertex/base.py", line 640, in _build_results
    result = await initialize.loading.get_instance_results(
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/interface/initialize/loading.py", line 76, in get_instance_results
    return await build_component(params=custom_params, custom_component=custom_component)
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/interface/initialize/loading.py", line 299, in build_component
    build_results, artifacts = await custom_component.build_results()
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/custom/custom_component/component.py", line 1136, in build_results
    return await self._build_with_tracing()
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/custom/custom_component/component.py", line 1118, in _build_with_tracing
    results, artifacts = await self._build_results()
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/custom/custom_component/component.py", line 1163, in _build_results
    result = await self._get_output_result(output)
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/custom/custom_component/component.py", line 1238, in _get_output_result
    result = await method() if inspect.iscoroutinefunction(method) else await asyncio.to_thread(method)
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/base/models/model.py", line 88, in text_response
    result = await self.get_chat_result(
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/base/models/model.py", line 180, in get_chat_result
    return await self._get_chat_result(
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/base/models/model.py", line 232, in _get_chat_result
    messages.append(input_value.to_lc_message(self.name))
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/schema/message.py", line 184, in to_lc_message
    file_contents = self.get_file_content_dicts(model_name)
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/schema/message.py", line 256, in get_file_content_dicts
    content_dicts.append(create_image_content_dict(file, None, model_name))
  File "/Users/ori/Work/research/langchain/langflow/src/lfx/src/lfx/utils/image.py", line 96, in create_image_content_dict
    ...

This triggers Langflow to feed the file into the LLM as an Image. Reading the files back depends on the specific LLM configuration.

PoC

Reproduction:

  1. Create a new flow and add a Chat Input node to it
  2. Share the flow ("Shareable Playground")
  3. Access the public link with the browser developers tools open and execute the flow.
  4. Find the /api/v1/build_public_tmp route and copy as cURL
  5. Edit the files JSON field to point to any file.

Impact

Potential file read (local or S3) if shareable playground feature is used.

Ori Lahav Security Researcher @ Rubrik Inc.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) langflow < 1.10.0 1.10.0

References

CVSS score 6.1/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness (CWE)
CWE-73
Platform
Python (PyPI)
Package
langflow
Disclosed
16.06.2026
Updated
11.10.2026 14:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-244 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-rcjh-r59h-gq37 - 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 Shareable Playground arbitrary local or S3 file read this entry
    Medium · 6.1 CVE-2026-48520 < 1.10.0 1.10.0
  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
  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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