PT-2026-106365

Name of the Vulnerable Software and Affected Versions IBM Langflow OSS versions 1.0.0 through 1.12.2 Description Improper control of code generation allows a remote attacker to execute arbitrary code on the system. Recommendations Upgrade to Langflow version 1.12.3...

VulnCheck KEV: CVE-2026-51886

langflow-ai langflow v1.9.3 is affected by: Code Injection. The impact is: execute arbitrary code remote. The component is: src/backend/base/langflow/api/v1/validate.py:validate-postvalidatecode-a-real-authenticated-http-post-to-api-v1. The attack vector is: Attack surface: HTTP or browser-backed...

EUVD-2026-53547

Langflow: Weak Fernet Key via random.seed...

GHSA-JXW3-MJMX-3PQM Langflow: Weak Fernet Key via random.seed()

Summary Langflow uses Python's random module Mersenne Twister, a non-cryptographic PRNG seeded with the SECRETKEY to derive the Fernet encryption key for all stored user credentials API keys, LLM provider secrets, database passwords. When the SECRETKEY is shorter than 32 characters — a common...

Langflow: Weak Fernet Key via random.seed()

Summary Langflow uses Python's random module Mersenne Twister, a non-cryptographic PRNG seeded with the SECRETKEY to derive the Fernet encryption key for all stored user credentials API keys, LLM provider secrets, database passwords. When the SECRETKEY is shorter than 32 characters — a common...

EUVD-2026-45272

Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass...

GHSA-CF6M-VC3M-7CGM Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass

Summary A vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOKAUTHENABLE configuration is set to False. This allows a remote attacker who knows a flow's UUID ...

Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass

Summary A vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOKAUTHENABLE configuration is set to False. This allows a remote attacker who knows a flow's UUID ...

EUVD-2026-91120

Langflow: Title Authenticated Remote Code Execution in validatecode via Malicious Decorators Description...

GHSA-W584-2H2R-2HVF Langflow: Title Authenticated Remote Code Execution in validate_code via Malicious Decorators Description

Summary: A critical Authenticated Remote Code Execution RCE vulnerability exists in the validatecode function of Langflow. The /api/v1/validate/code endpoint, meant to validate user-supplied code, leverages Python's exec function. While it attempts to restrict execution to function definitions, i...

Langflow: Title Authenticated Remote Code Execution in validate_code via Malicious Decorators Description

Summary: A critical Authenticated Remote Code Execution RCE vulnerability exists in the validatecode function of Langflow. The /api/v1/validate/code endpoint, meant to validate user-supplied code, leverages Python's exec function. While it attempts to restrict execution to function definitions, i...

EUVD-2026-26838

Langflow: Prompt injection in Langflow Smart Transform can lead to code execution...

GHSA-9FPM-3445-2VX4 Langflow: Prompt injection in Langflow Smart Transform can lead to code execution

Summary Langflow versions 1.3.0 through 1.10.2 contain a code-injection vulnerability in the Smart Transform LambdaFilterComponent component. Smart Transform places flow-author instructions and a preview of its input data into a prompt asking an LLM to generate a Python lambda. It then extracts a...

Langflow: Prompt injection in Langflow Smart Transform can lead to code execution

Summary Langflow versions 1.3.0 through 1.10.2 contain a code-injection vulnerability in the Smart Transform LambdaFilterComponent component. Smart Transform places flow-author instructions and a preview of its input data into a prompt asking an LLM to generate a Python lambda. It then extracts a...

CVE-2026-27966

CVE-2026-27966 — Langflow Remote Code Execution Scanner Pre-Auth Route Injection + Vertex Injection → Python Code Execution Overview CVE-2026-27966 is a critical-severity CVSS 9.8 pre-authentication remote code execution vulnerability in Langflow versions prior to 1.8.0. The vulnerability stems...

CVE-2026-105698

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.0.0 until 1.10.1, Langflow did not verify flow ownership in the deprecated POST /api/v1/build/flowid/vertices and POST /api/v1/build/flowid/vertices/vertexid handlers. Through version 1.7.1, an unauthenticated...

CVE-2026-105741

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.5.0 until 1.10.3, an IP spoofing vulnerability in the Model Context Protocol MCP configuration installation endpoint POST /api/v1/mcp/project/projectid/install allowed authenticated remote attackers to bypass th...

CVE-2026-105697

Langflow is a tool for building and deploying AI-powered agents and workflows. Before Langflow 1.10.3, the MCP stdio transport launched whatever command / args a user put in an MCP server configuration, with no allowlist and before 1.10.3 wrapped in bash -c "exec command ...". Any user able to...

CVE-2026-105699

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.6.8 until 1.9.1, Langflow authenticated access to the project identifier in a project-scoped MCP connection but did not authorize the resource URI supplied to resources/read. readresource forwarded the...

CVE-2026-105740

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, any authenticated Langflow user can achieve Remote Code Execution RCE on the server by adding an MCP server with the "Stdio" transport. The user-supplied command field is passed directly to bash -c "exe...