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CVE-2026-33309— Langflow has an Arbitrary File Write (RCE) via v2 API

Quick assessment

Affected
langflow-ai langflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 1.2.0至1.8.1版本存在访问控制错误漏洞，该漏洞源于底层存储层缺少边界检查，可能导致经过身份验证的攻击者执行任意文件写入和远程代码执行。

CVSS 10.0 · Critical EPSS 1.05% · P63
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I. Basic Information for CVE-2026-33309

Vulnerability Information
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Vulnerability Title
Langflow has an Arbitrary File Write (RCE) via v2 API
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 (External Control of File Name), leading to the root architectural issue within `LocalStorageService` remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer `ValidatedFileName` dependency. This defense-in-depth failure leaves the `POST /api/v2/files/` endpoint vulnerable to Arbitrary File Write. The multipart upload filename bypasses the path-parameter guard, allowing authenticated attackers to write files anywhere on the host system, leading to Remote Code Execution (RCE). Version 1.9.0 contains an updated fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 访问控制错误漏洞
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 1.2.0至1.8.1版本存在访问控制错误漏洞，该漏洞源于底层存储层缺少边界检查，可能导致经过身份验证的攻击者执行任意文件写入和远程代码执行。
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 >= 1.2.0, < 1.9.0 -

II. Public POCs for CVE-2026-33309

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III. Intelligence Information for CVE-2026-33309

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Vendor Advisories for CVE-2026-33309 (1)

Same Patch Batch · langflow-ai · 2026-03-24 · 4 CVEs total

CVE-2026-33475 9.1 CRITICAL Langflow GitHub Actions Shell Injection
CVE-2026-33484 7.5 HIGH Langflow has Unauthenticated IDOR on Image Downloads
CVE-2026-33497 Langflow: /profile_pictures/{folder_name}/{file_name} endpoint file reading

IV. Related Vulnerabilities

Same product: langflow
Same vendor: langflow-ai
Same weakness: CWE-22

V. Comments for CVE-2026-33309

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