CVE-2024-9277 Langflow HTTP POST Request utils.py redos

What is CVE-2024-9277?

CVE-2024-9277 is a medium-severity denial of service vulnerability in Langflow Langflow, published on 27 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability classified as problematic was found in Langflow up to 1.0.18. Affected by this vulnerability is an unknown functionality of the file \src\backend\base\langflow\interface\utils.py of the component HTTP POST Request Handler. The manipulation of the argument remaining_text leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-1333

Which versions are affected by CVE-2024-9277?

3 open source packages ship an affected version, including langflow. It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2024-9277?

No fix has been published for CVE-2024-9277 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-9277 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-9277 exists.

Other vulnerabilities in Langflow Langflow

• CVE-2026-9198 IBM Langflow Code Injection Exploited Critical 9.8
• CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Exploited Critical 9.8
• CVE-2025-3248 Langflow Missing Authentication Exploited Critical 9.8
• CVE-2025-34291 Langflow Origin Validation Error Exploited Critical 9.4
• CVE-2026-33017 Langflow Code Injection Exploited Critical 9.3

All Langflow Langflow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-355v-2rjx-fpx7, PYSEC-2026-1521.