What is CVE-2026-42048?

CVE-2026-42048 is a critical-severity vulnerability in Langflow, classified under Path Traversal. CVSS score: 9.6/10. Published 2026-05-12.

How severe is CVE-2026-42048?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2026-42048 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Langflow

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 knowledg…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (3.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H.

Affected products

Langflow
Langflow-ai Langflow — versions < 1.9.0

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

EQSTLab/CVE-2026-42048

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42048?: CVE-2026-42048 is a critical-severity vulnerability in Langflow, classified under Path Traversal. CVSS score: 9.6/10. Published 2026-05-12.
How severe is CVE-2026-42048?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2026-42048 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.