Is CVE-2026-6596 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-6596 being exploited in the wild.

How severe is CVE-2026-6596?

High severity, with a CVSS score of 7.3, published 20 April 2026.

Which products and versions are affected?

langflow-base (PyPI) < 0.9.1, < 1.9.1, ECOSYSTEM:introduced=0,fixed=0.9.1.

Is there a fix for CVE-2026-6596?

Yes. langflow-base (PyPI): upgrade to 0.9.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-6596 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-6596?

Check whether you run langflow-base (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-6596: Langflow unrestricted file upload in API Endpoint

Q: Is there a fix for CVE-2026-6596?

Yes. langflow-base (PyPI): upgrade to 0.9.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-6596 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-6596?

Check whether you run langflow-base (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-6596 · Severity: high · CVSS 7.3 · Published 2026-04-20

Langflow is a tool used to build and manage AI-driven applications. A security flaw in its file upload system allows an attacker to upload files of any size without needing to log in. This can be used to fill up server storage or consume system resources, potentially causing the service to crash or become unavailable to legitimate users.

Technologies: langflow-base (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-6596 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-6596 being exploited in the wild.
How severe is CVE-2026-6596?: High severity, with a CVSS score of 7.3, published 20 April 2026.
Which products and versions are affected?: langflow-base (PyPI) < 0.9.1, < 1.9.1, ECOSYSTEM:introduced=0,fixed=0.9.1.
Is there a fix for CVE-2026-6596?: Yes. langflow-base (PyPI): upgrade to 0.9.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-6596 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-6596?: Check whether you run langflow-base (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

langflow-base (PyPI): upgrade to 0.9.1 or later
```
pip install "langflow-base>=0.9.1"
```

Technical details

A vulnerability exists in the `create_upload_file` function within `src/backend/base/Langflow/api/v1/endpoints.py` of Langflow. The endpoint lacks proper authentication and fails to enforce file size restrictions on uploaded content. A remote, unauthenticated attacker can exploit this by sending large volumes of data or excessively large files to the API, leading to resource exhaustion (disk space or memory) and a Denial of Service. While the vendor was reportedly unresponsive during initial disclosure, patches are available in version 0.9.1 for langflow-base.

Affected products

langflow-ai langflow-base < 0.9.1
langflow-ai langflow <= 1.1.0

Identifiers

CVE-2026-6596
GHSA-vvfc-fp59-m92g
PYSEC-2026-2572

Timeline

2026-04-20: disclosed
2026-04-20: advisory

References

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