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CISA KEV · Vulnerability

A 9.8 hole in Langflow is under active exploitation: two open endpoints hand out full-access code execution

CVE-2026-9198 in Langflow - the visual builder for AI applications - lets anyone on the network issue themselves a SUPERUSER token and run arbitrary code, no password needed. On 4 August CISA added it to the catalog of actively exploited vulnerabilities. The patch is version 1.10.1.

Source
NVD
Published
The event
Checked on
Responsible editor
Cvetelin Ivanov
How we work
MethodCorrections

Langflow is one of the tools people use to 'click together' AI agents with no code. Boxes, arrows, done. That's exactly why this hole hurts so much: there are a lot of installs, and their owners rarely follow security bulletins.

Fact

The facts: CVE-2026-9198 affects Langflow OSS from version 1.0.0 through 1.10.0 inclusive, scored 9.8 out of a maximum 10. The chain is two unauthenticated API endpoints: /api/v1/auto_login issues a SUPERUSER token, and /api/v1/validate/code executes submitted code - on a default install that means remote code execution with full privileges, no password at all. The vulnerability was published on 17 July, and on 4 August CISA added it to the KEV catalog of actively exploited vulnerabilities - the patch deadline for US federal agencies is 7 August, three days. The fix: version 1.10.1 or later. Sources: NVD and CISA KEV, 04.08.2026.

One thing I keep asking: how many of these installs even have an owner? Langflow gets spun up for an afternoon - a demo for the boss, an intern's experiment, a prototype to 'see if it works'. Then the demo keeps running on a server with a public address, and everyone forgets about it. Low-code AI builders became infrastructure without going through the discipline of infrastructure. Nobody puts 'patch every month' on their calendar for them.

And the second layer: these systems hold keys by definition. A Langflow install with no API keys to models and databases is a rarity, so a compromised install is not just another machine. It's a connection to everything the demo has ever touched.

The demo nobody remembers is the door everyone is looking for.

Check today: if you or a client is running Langflow, bump the version to 1.10.1 right away, and public access goes behind a VPN or at least proxy-level authentication. And one thing to remember for every AI demo from here on - either it has an owner and a patch calendar, or it gets switched off.

The visual is generated code-art, no third-party images.