CVE-2026-7869: Langflow OSS is affected by arbitrary code execution in custom component validation and trusted code enforcement

Published Aug 5, 2026
·
Updated

IBM Langflow OSS 1.0.0 through 1.10.3 is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledgebases). 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.

Other sources

Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledgebases). 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.

— IBM

Affected Software

3 affected components
IBM Langflow OSS>=1.0.0<=1.10.3
IBM Langflow OSS
IBM Langflow OSS<=1.0.0-1.10.3

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM Langflow OSS to a version that resolves this vulnerability.

    Fixed in 1.11.0
  2. Compensating control

    Apply compensating control for the affected endpoint by restricting access to POST /api/v1/knowledge_bases (e.g., allow only trusted users/IPs via network ACL/WAF) until the server is upgraded.

Event History

Aug 5, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
CVE Published
via MITRE·06:13 PM
Data Sourced
via MITRE·06:13 PM
RemedyDescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

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CVE-2026-7869 - Langflow OSS is affected by arbitrary code execution in custom component validation and trusted code enforcement - SecAlerts