CVE-2026-42048— Langflow: Path Traversal in Langflow Knowledge Bases API
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| langflow-ai | langflow | < 1.9.0 | affected |
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I. Basic Information for CVE-2026-42048
Vulnerability Information
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Vulnerability Title
Langflow: Path Traversal in Langflow Knowledge Bases API
Source: NVD (National Vulnerability Database)
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 (DELETE /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are concatenated directly into file paths without proper sanitization or boundary validation. An authenticated attacker can exploit this flaw to delete arbitrary directories anywhere on the server's filesystem, leading to data loss and potential service disruption. This vulnerability is fixed in 1.9.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Langflow 路径遍历漏洞
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 1.9.0之前版本存在路径遍历漏洞，该漏洞源于知识库API路径遍历，可能导致认证攻击者删除任意目录。
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-2026-42048
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|---|
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V. Comments for CVE-2026-42048
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