CVE-2026-42048

Name: CVE-2026-42048
Creator: NVD / NIST
Published: 2026-05-12T18:17:23.78+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 4.42%

Last modified Jun 17, 2026

CVE-2026-42048 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. 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). EPSS estimates a 4.42% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.6/10

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

EPSS Probability

4.42%

90.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Langflow	Langflow	< 1.9.0

References

https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68qExploit, Vendor Advisory
https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68qExploit, Vendor Advisory

Timeline

Published: May 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42048?

How severe is CVE-2026-42048?

CVE-2026-42048 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 4.42% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42048?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42048?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST