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CVE-2026-55446— Langflow: Unauthenticated DoS through multipart form boundary file upload

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 1.0.19之前版本存在资源管理错误漏洞，该漏洞源于资源管理错误，可能导致攻击者通过发送/api/v1/files/upload/请求，无需认证利用超长多部分表单边界，使应用长时间不可用。

CVSS 7.5 · High EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
langflow-ai langflow < 1.0.19 affected
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I. Basic Information for CVE-2026-55446

Vulnerability Information
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Vulnerability Title
Langflow: Unauthenticated DoS through multipart form boundary file upload
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 资源管理错误漏洞
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 1.0.19之前版本存在资源管理错误漏洞，该漏洞源于资源管理错误，可能导致攻击者通过发送/api/v1/files/upload/请求，无需认证利用超长多部分表单边界，使应用长时间不可用。
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 < 1.0.19 -

II. Public POCs for CVE-2026-55446

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7309 chars
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III. Intelligence Information for CVE-2026-55446

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Patches & Fixes for CVE-2026-55446 (1)

Vendor Advisories for CVE-2026-55446 (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-2026-55450 9.3 CRITICAL Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
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-2026-42867 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-400

V. Comments for CVE-2026-55446

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