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CVE-2026-42867— Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint

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 1.9.0之前版本存在路径遍历漏洞，该漏洞源于用户提供的知识库名称直接用于创建文件路径，未经正确清理或包含检查，可能导致经过身份验证的攻击者在服务器文件系统上任意目录创建文件。

CVSS 6.5 · Medium EPSS 0.47% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
langflow-ai langflow < 1.9.0 affected
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I. Basic Information for CVE-2026-42867

Vulnerability Information
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Vulnerability Title
Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem. This vulnerability is fixed in 1.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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 路径遍历漏洞
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 1.9.0之前版本存在路径遍历漏洞，该漏洞源于用户提供的知识库名称直接用于创建文件路径，未经正确清理或包含检查，可能导致经过身份验证的攻击者在服务器文件系统上任意目录创建文件。
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 < 1.9.0 -

II. Public POCs for CVE-2026-42867

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III. Intelligence Information for CVE-2026-42867

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Patches & Fixes for CVE-2026-42867 (1)

Vendor Advisories for CVE-2026-42867 (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-2026-55446 7.5 HIGH Langflow: Unauthenticated DoS through multipart form boundary file upload
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-22

V. Comments for CVE-2026-42867

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