Vulnerability Report

CVE-2026-42048

Title: Path Traversal in Langflow Knowledge Bases API

Arbitrary File Access

Proof Of Concept

PoC Available for CVE-2026-42048

CWE Category CWE-22

Published Date May 12, 2026

Modified Date May 14, 2026

Exploit Status Available

Score 9.6 CVSS v3.1

Exploit Probability (EPSS)

0.52%

Vulnerability Summary

CVE-2026-42048: 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.

Impacted Vendors

langflow 1

Reference Links

https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.6

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42048 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/EQSTLab/CVE-2026-42048

View Code

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

May 12, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Affected Stack

No specific products linked.