CVE-2026-42048
Langflow: Path Traversal in Langflow Knowledge Bases API
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.
INFO
Published Date :
May 12, 2026, 6:17 p.m.
Last Modified :
May 14, 2026, 12:52 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Langflow to version 1.9.0 or later.
- Ensure knowledge base names are properly validated.
Public PoC/Exploit Available at Github
CVE-2026-42048 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42048.
| URL | Resource |
|---|---|
| https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q | Exploit Vendor Advisory |
| https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42048 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42048
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Langflow Arbitrary Directory Deletion
Dockerfile Python Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42048 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42048 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* versions up to (excluding) 1.9.0 Added Reference Type CISA-ADP: https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 13, 2026
Action Type Old Value New Value Added Reference https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q -
New CVE Received by [email protected]
May. 12, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H Added CWE CWE-22 Added Reference https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q