CVE-2026-9201
Received Received - Intake

IBM Langflow OSS Cryptographic Weakness Leads to Arbitrary Code Execution

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 could allow an authenticated attacker to execute arbitrary code due to a cryptographic weakness in the custom component validation mechanism. When the optional hardening mode that restricts execution to trusted component templates is enabled, the application validates component code using a truncated SHA‑256 hash. Because the hash comparison relies on only a portion of the digest, an attacker can craft malicious component code that collides with a trusted template hash and bypasses validation. Successful exploitation allows the attacker to introduce and execute unauthorized Python code within the Langflow process, defeating the intended security control and potentially leading to full compromise of the affected instance.

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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-2026-9201
EUVD
EUVD-2026-53572

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
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-326 The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.

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Executive Summary

IBM Langflow OSS versions 1.0.0 through 1.10.3 have a cryptographic weakness in their custom component validation mechanism. When the optional hardening mode is enabled, the application uses a truncated SHA-256 hash to validate trusted component templates. Attackers can exploit this by crafting malicious code that produces the same truncated hash as a trusted template, bypassing security checks and executing unauthorized Python code within the Langflow process.

Detection Guidance

Detecting this vulnerability requires checking for IBM Langflow instances running versions 1.0.0 through 1.10.3. Inspect installed versions via package managers like pip (pip show langflow) or check running processes. Look for custom components with unusual code or hash mismatches in trusted templates.

Impact Analysis

This vulnerability allows authenticated attackers to execute arbitrary code on the affected system. If exploited, it could lead to full compromise of the Langflow instance, unauthorized data access, modification, or deletion, and potential lateral movement within the network if the system has broader connectivity.

Compliance Impact

This vulnerability could lead to unauthorized code execution, potentially resulting in data breaches. Such breaches may violate compliance requirements under GDPR (data protection), HIPAA (health information security), or other regulations, leading to legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Upgrade IBM Langflow to a version beyond 1.10.3 immediately. Disable the optional hardening mode if enabled, as it is ineffective. Review all custom components for unauthorized code and revoke access for any suspicious users.

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