CVE-2026-42867 | Langflow is a tool for building and deploying AI-powered age… | CVSS 6.5 MEDIUM

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 (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.

Metadata

CVE ID: CVE-2026-42867
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-04-30 18:49 UTC
Published: 2026-06-23 16:29 UTC
Last updated: 2026-06-23 17:02 UTC
Primary CWE: CWE-22
CWE-22: Improper Limitation of a Pathname to a Restricted Di…
Vendor / Product: langflow-ai / langflow
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
langflow-ai	langflow	—	< 1.9.0

Weakness (CWE)

CWE	Source	Description
CWE-22	cna	CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

References (2)

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