CVE-2026-104339

Langflow unauthenticated command injection can execute server code

IBM / Langflow · Langflow OSS

First documented disclosure · Review checkpoint

Summary

Remote code execution in the vulnerable application context.

Severity and exploitation evidence

Critical · 9.8/10 · CVSS 3.1. Severity source.

Exploitation not established: The reviewed primary records do not establish malicious exploitation or a confirmed victim.

Exploitation evidence source

Technical severity is not a measure of observed attacks or of risk to your deployment. Attempts, demonstrations, and successful compromise retain the qualifications in the source.

How the weakness works

Command construction insufficiently neutralizes special input. The public CNA does not identify the affected endpoint.

Conditions required

Network access to the affected path; IBM’s vector requires no login or user interaction.

Potential impact

Remote code execution in the vulnerable application context.

Affected versions and configurations

IBM lists Langflow OSS 1.0.0 through 1.12.3.

Fix and mitigation status

1.12.4 per IBM; this is an issue-specific fix, not assurance that the old release addresses later findings.

Practical next steps

Upgrade to a current supported release containing the fix; back up the deployment and validate workflow behavior.

Operating lesson

Remove public exposure of execution-capable services while deploying verified fixes.

Evidence and limits

IBM bulletin 7293015 was initially published 2026-10-19; the CNA record followed on 2026-10-29. Earlier upstream patches are not assigned to this CVE by inference. Exact technical details absent from the public record remain unknown; a CVSS score is not an observed incident.

Sources