CVE catalog
CVE-2026-42867
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
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.47% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | langflow | Not reported | 1.9.0 | fixed |
| Cpe | langflow | Not reported | 1.9.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | langflow | cpe | Not reported | 1.9.0 | Not reported | Not reported | Not reported |
| Cpe | langflow | cpe | Not reported | 1.9.0 | Not reported | NVD-CVE-2026-42867 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://github.com/langflow-ai/langflow/pull/12337]
- [https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-42867]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1898.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)]