CVE-2026-104316

Langflow job cancellation lacks flow ownership checks

IBM / Langflow · Langflow OSS

First documented disclosure · Review checkpoint

Summary

Termination of that job and loss of in-progress computation.

Severity and exploitation evidence

Medium · 6.5/10 · 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

A cancellation request is accepted without verifying permission over the target flow’s running background job.

Conditions required

An authenticated attacker can address another user’s running job.

Potential impact

Termination of that job and loss of in-progress computation.

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

Authorize cancellation and other lifecycle operations against the specific workload owner.

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