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CVE-2026-33017— Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint

Quick assessment

Affected
langflow-ai langflow
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.9.0之前版本存在安全漏洞，该漏洞源于/api/v1/build_public_tmp/{flow_id}/flow端点接受攻击者控制的流程数据并传递给exec函数，可能导致未经验证的远程代码执行。

AI Predicted 9.8 Difficulty: Easy KEV EPSS 24.75% · P98

Affected Version Matrix 1

VendorProduct Version RangeStatus
langflow-ai langflow < 1.9.0 affected
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I. Basic Information for CVE-2026-33017

Vulnerability Information
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Vulnerability Title
Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution. This is distinct from CVE-2025-3248, which fixed /api/v1/validate/code by adding authentication. The build_public_tmp endpoint is designed to be unauthenticated (for public flows) but incorrectly accepts attacker-supplied flow data containing arbitrary executable code. This issue has been fixed in version 1.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.9.0之前版本存在安全漏洞，该漏洞源于/api/v1/build_public_tmp/{flow_id}/flow端点接受攻击者控制的流程数据并传递给exec函数，可能导致未经验证的远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
langflow-ai langflow < 1.9.0 -

II. Public POCs for CVE-2026-33017

# POC Description Source Link Shenlong Link
1 Langflow versions prior to 1.9.0 are vulnerable to unauthenticated remote code execution (RCE) via the build_public_tmp endpoint. Attackers can submit a manipulated flow JSON containing Python code that is executed during the build process without proper sandboxing. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33017.yaml POC Details
2 https://github.com/vulhub/vulhub/blob/master/langflow/CVE-2026-33017/README.md POC Details
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III. Intelligence Information for CVE-2026-33017

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Patches & Fixes for CVE-2026-33017 (1)

Vendor Advisories for CVE-2026-33017 (2)

IV. Related Vulnerabilities

Same product: langflow
Same vendor: langflow-ai
Same weakness: CWE-94

V. Comments for CVE-2026-33017

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