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CVE-2026-5027— Langflow - Path Traversal Arbitrary File Write via upload_user_file

Quick assessment

Affected
langflow-ai langflow
Exploitation
Public or AI PoC available; prioritize validation
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存在安全漏洞，该漏洞源于端点POST /api/v2/files未清理multipart表单数据中的filename参数，可能导致攻击者通过路径遍历序列将文件写入文件系统的任意位置。

CVSS 8.8 · High EPSS 4.76% · P92

Public Exploits 2

ExploitDB · 1 EDB-52659 [webapps]
Nuclei · 1 CVE-2026-5027.yaml [template]

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-5027

Vulnerability Information
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Vulnerability Title
Langflow - Path Traversal Arbitrary File Write via upload_user_file
Source: CVE Program / CVE List V5
Vulnerability Description
The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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 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存在安全漏洞，该漏洞源于端点POST /api/v2/files未清理multipart表单数据中的filename参数，可能导致攻击者通过路径遍历序列将文件写入文件系统的任意位置。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langflow-ai langflow 0 -

II. Public POCs for CVE-2026-5027

# POC Description Source Link Shenlong Link
1 The application contains a path traversal vulnerability caused by unsanitized 'filename' parameter in the 'POST /api/v2/files' multipart form data, letting attackers write files to arbitrary filesystem locations, exploit requires crafted request. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-5027.yaml POC Details
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III. Intelligence Information for CVE-2026-5027

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Vendor Advisories for CVE-2026-5027 (1)

Same Patch Batch · langflow-ai · 2026-03-27 · 6 CVEs total

CVE-2026-5025 6.5 MEDIUM Langflow - Application Logs Exposed to All Authenticated Users
CVE-2026-5022 Langflow - Missing Authorization on download_image Endpoint
CVE-2026-5026 Langflow - Stored XSS via Malicious SVG Upload
CVE-2026-34046 Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership
CVE-2026-33873 Langflow has Authenticated Code Execution in Agentic Assistant Validation

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-5027

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