CVE-2026-18729 Code injection in Langflow OSS

What is CVE-2026-18729?

CVE-2026-18729 is a high-severity code injection vulnerability in Langflow Langflow, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote authenticated attacker to execute arbitrary code due to improper control of generation of code.

Weakness: CWE-94

Which versions are affected by CVE-2026-18729?

It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-18729?

No fix has been published for CVE-2026-18729 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-18729 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18729 exists.

Public exploit code: 1 Metasploit module and 1 proofs of concept on GitHub.

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-q78m-9m47-w7gw.