CVE-2026-10547
Received Received - Intake

IBM Langflow Graph Data Injection Vulnerability

Publication date: 2026-08-05

Last updated on: 2026-08-05

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.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-10547
EUVD
EUVD-2026-53551

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
ibm langflow_oss From 1.0.0 (inc) to 1.10.3 (inc)
ibm langflow From 1.0.0 (inc) to 1.10.3 (inc)

Helpful Resources

Exploitability

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

Attack-Flow Graph

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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.

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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