CVE-2026-10547

Analyzed Analyzed - Analysis Complete

IBM Langflow Graph Data Injection Vulnerability

Publication date: 2026-08-05

Last updated on: 2026-08-06

Assigner: IBM Corporation

Description

IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate ownership in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint, allowing an authenticated user to inject arbitrary graph data into a shared cache for any flow. This may result in cross-user cache pollution, unauthorized workflow execution, or denial of service.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-05

Last Modified

2026-08-06

Generated

2026-08-26

AI Q&A

2026-08-05

EPSS Evaluated

2026-08-24

NVD

CVE-2026-10547

EUVD

EUVD-2026-53551

Affected Vendors & Products

Vendor	Product	Version / Range
langflow	langflow	From 1.0.0 (inc) to 1.11.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability exists in IBM Langflow OSS versions 1.0.0 through 1.10.3 due to improper validation of ownership in a deprecated API endpoint. An authenticated user can inject arbitrary graph data into a shared cache for any flow, potentially causing cache pollution or unauthorized workflow execution.

Detection Guidance

To detect this vulnerability, check if your Langflow OSS instance is running versions 1.0.0 through 1.10.3. Inspect network logs for POST requests to the deprecated /api/v1/build/{flow_id}/vertices endpoint. Look for unauthorized graph data injections or cache pollution events.

Impact Analysis

This vulnerability may allow unauthorized users to execute workflows, corrupt shared caches, or disrupt services through denial of service. It requires authentication but could impact multi-user environments using shared Langflow instances.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA due to unauthorized workflow execution and cache pollution risks. Unauthorized access to workflows may lead to data breaches or improper data handling, violating GDPR principles of data protection and HIPAA requirements for safeguarding protected health information.

Mitigation Strategies

Upgrade Langflow OSS to version 1.11.0 or newer immediately. Disable or restrict access to the deprecated POST /api/v1/build/{flow_id}/vertices endpoint if possible. Monitor for unusual workflow executions or cache anomalies.

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