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CVE-2026-55450— Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

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团队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 1.9.1之前版本存在安全漏洞，该漏洞源于未经验证的用户可上传任意数据且无限制，可能导致服务器空间耗尽，同时响应中报告了上传文件的绝对路径，存在信息泄露风险。

CVSS 9.3 · Critical EPSS 1.19% · P67

Public Exploits 1

Nuclei · 1 CVE-2026-55450.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
langflow-ai langflow < 1.9.1 affected
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I. Basic Information for CVE-2026-55450

Vulnerability Information
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Vulnerability Title
Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Langflow是Langflow团队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 1.9.1之前版本存在安全漏洞，该漏洞源于未经验证的用户可上传任意数据且无限制，可能导致服务器空间耗尽，同时响应中报告了上传文件的绝对路径，存在信息泄露风险。
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 < 1.9.1 -

II. Public POCs for CVE-2026-55450

# POC Description Source Link Shenlong Link
1 Langflow < 1.9.1 contains an unrestricted file upload caused by lack of upload limitations, letting unauthenticated attackers exhaust server space and leak absolute file paths, exploit requires network access. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-55450.yaml POC Details
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Qwen3.6-35B-A3B · 7877 chars
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III. Intelligence Information for CVE-2026-55450

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Patches & Fixes for CVE-2026-55450 (1)

Vendor Advisories for CVE-2026-55450 (1)

Same Patch Batch · langflow-ai · 2026-06-23 · 9 CVEs total

CVE-2026-48519 9.6 CRITICAL Langflow: Unauthenticated RCE in Shareable Playgrounds
CVE-2026-55447 9.6 CRITICAL Langflow: BaseFileComponent-based nodes arbitrary file read with RCE exploit
CVE-2026-33760 8.8 HIGH Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints
CVE-2026-55255 8.4 HIGH Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attacker
CVE-2026-55446 7.5 HIGH Langflow: Unauthenticated DoS through multipart form boundary file upload
CVE-2026-42867 6.5 MEDIUM Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint
CVE-2026-48520 6.1 MEDIUM Langflow: Unauthenticated Shareable Playground arbitrary local or S3 file read
CVE-2026-55423 6.1 MEDIUM Langflow: Logout button does not clear session

IV. Related Vulnerabilities

Same product: langflow
Same vendor: langflow-ai
Same weakness: CWE-200

V. Comments for CVE-2026-55450

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