---
cve: "CVE-2026-42867"
severity: "MEDIUM"
cvss: 6.5
epss: "35%"
vendor: "langflow-ai"
kev: false
exploited: false
published: "2026-06-23 17:16:58"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T23:09:40+02:00"
---

# CVE-2026-42867

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

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 (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem. This vulnerability is fixed in 1.9.0.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- a47f2ad17eb662e940c550cfccb64a87dddd7e0b (Commit)

## Referenzen

- <https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq>
- <https://github.com/langflow-ai/langflow/pull/12337>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42867) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_