CVE-2026-13435
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Improper Input Validation in IBM Langflow OSS

Publication date: 2026-07-30

Last updated on: 2026-07-30

Assigner: IBM Corporation

Description
IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox implementation.

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Meta Information

Published
2026-07-30
Last Modified
2026-07-30
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-13435
EUVD
EUVD-2026-51244

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ibm langflow From 1.0.0 (inc) to 1.10.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

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Executive Summary

IBM Langflow OSS versions 1.0.0 through 1.10.1 have an improper input validation flaw in the PythonREPL sandbox. This allows attackers with local access to execute arbitrary code due to insufficient checks on user-provided input.

Detection Guidance

This vulnerability involves improper input validation in IBM Langflow OSS 1.0.0 through 1.10.1. Detection requires checking installed versions of Langflow and inspecting PythonREPL sandbox configurations for potential bypasses. No specific commands are provided in the context.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or disrupting operations. The high CVSS score (9.9) indicates severe risk requiring immediate patching.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face fines or legal penalties for non-compliance due to insufficient security controls.

Mitigation Strategies

Update IBM Langflow OSS to a version beyond 1.10.1 to address the improper input validation in the PythonREPL sandbox. If immediate update is not possible, restrict access to the PythonREPL sandbox and monitor for suspicious activity.

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