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Security Bulletin: Code Injection Vulnerability in Code Validation Endpoint

Security Bulletin


Summary

A code injection vulnerability was identified in the code validation endpoint that allowed authenticated users to execute arbitrary code on the server. The vulnerability existed in the validation logic which compiled and executed function definitions to check for import errors. Attackers could exploit Python's default argument evaluation mechanism to achieve code execution during the validation process without the function ever being called. The issue was addressed by removing the execution step from the validation path and using compile-only validation.

Vulnerability Details

CVEID:   CVE-2026-7873
DESCRIPTION:   Langflow OSS allows authenticated attackers to execute arbitrary OS commands and read sensitive files including credentials, enabling complete system compromise and lateral movement.
CWE:   CWE-94: Improper Control of Generation of Code ('Code Injection')
CVSS Source:   IBM
CVSS Base score:   9.9
CVSS Vector:   (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
Langflow OSS1.0.0-1.10.0

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now by upgrading Langflow OSS to version 1.10.1

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

29 Jun 2026: Initial Publication

*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:
29 June 2026

Initial Publish date:
29 June 2026

UID

ibm17278441