CVE-2026-42867: Langflow path traversal in Knowledge Bases API

# CVE-2026-42867: Langflow path traversal in Knowledge Bases API

https://gcdradar.vercel.app/incidents/cve-2026-42867-langflow-path-traversal-in-knowledge-bases-ap · AIR-2026-0744 · closed 2026-06-16

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-06-16
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-42867
- CVSS: 6.5

## Summary

Langflow suffers from a path traversal vulnerability in the Knowledge Bases creation endpoint due to unsanitized names. Authenticated attackers can leverage this flaw to write files anywhere on the server.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-06-23: CVE-2026-42867: Langflow is a tool for building and deploying AI-powered agents and workflows. (https://nvd.nist.gov/vuln/detail/CVE-2026-42867)
- 2026-06-16: CVE-2026-42867: Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint (https://github.com/advisories/GHSA-79ph-745m-6wxq)

## Sources

- 2026-06-16 GitHub Advisory Database: CVE-2026-42867: Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint https://github.com/advisories/GHSA-79ph-745m-6wxq
- 2026-06-23 NVD: CVE-2026-42867: Langflow is a tool for building and deploying AI-powered agents and workflows. https://nvd.nist.gov/vuln/detail/CVE-2026-42867

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.