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CVE-2026-42867

Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint

Published: Jun 23, 2026Updated: Jun 26, 2026 Sources: CVE List NVDCWE-22
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 76.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-22

Affected Products

langflow
commercialaka langflow-base, langflow desktop
langflowSaaS
AI / ML / ai-agent-tooling
langflow-ai
commercial
langflowSaaS
AI / ML

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

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

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