Security Bulletin
Summary
Langflow OSS contains a code injection vulnerability in its code validation endpoint. The endpoint executed submitted function definitions during validation, allowing decorator and default-argument expressions to run. An attacker with access to the endpoint could execute arbitrary commands with the privileges of the Langflow process, potentially accessing sensitive information or modifying files.
Vulnerability Details
CVEID: CVE-2026-6543
DESCRIPTION: IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow allows an attacker to execute arbitrary commands with the privileges of the process running Langflow. This allows reading sensitive environment variables (API keys, DB credentials), modifying files, or launching further attacks on the internal network.
CWE: CWE-94: Improper Control of Generation of Code ('Code Injection')
CVSS Source: IBM
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Langflow OSS | 1.0.0 - 1.10.0 |
Remediation/Fixes
The custom-component restrictions introduced in version 1.9.0 did not fix this endpoint.
IBM recommends addressing the vulnerability now by upgrading to Langflow OSS 1.10.1 or newer: https://github.com/langflow-ai/langflow
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Eran Shimony (Palo Alto Networks)
Change History
27 Apr 2026: Initial Publication
08 Oct 2026: Corrected the affected version range and remediation guidance to identify version 1.10.1 as the fixed release.
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
08 October 2026
Initial Publish date:
27 April 2026
UID
ibm17270883