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CVE-2026-42048— Langflow: Path Traversal in Langflow Knowledge Bases API

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。

CVSS 9.6 · Critical EPSS 0.60% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: 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 (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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/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 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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III. Intelligence Information for CVE-2026-42048

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Vendor Advisories for CVE-2026-42048 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-42048

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