Arbitrary Code Injection Affecting lfx package, versions [,0.3.0rc3)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-LFX-15357988
- published26 Feb 2026
- disclosed26 Feb 2026
- creditweblover12
Introduced: 26 Feb 2026
CVE-2026-27966 (opens in a new tab)How to fix?
Upgrade lfx to version 0.3.0rc3 or higher.
Overview
lfx is a lfx is a command-line tool for running Langflow workflows. It provides two main commands: serve and run.
Affected versions of this package are vulnerable to Arbitrary Code Injection via the allow_dangerous_code=True which automatically exposes LangChain’s Python REPL tool (python_repl_ast). An attacker can execute arbitrary Python and operating system commands by leveraging prompt injection.