CVE-2026-104324

Langflow unsafe deserialization allows authenticated code execution

IBM / Langflow · Langflow OSS

First documented disclosure · Review checkpoint

Summary

Code execution with the application’s permissions.

Severity and exploitation evidence

High · 8.8/10 · 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

An authenticated input reaches unsafe deserialization; IBM does not publish the exact loader or endpoint.

Conditions required

Remote authenticated access to the affected deserialization feature.

Potential impact

Code execution with the application’s permissions.

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

Treat serialized objects as untrusted executable input unless the format is demonstrably data-only.

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