---
id: "CVE-2026-104339"
kind: "vulnerability"
aliases: ["CVE-2026-104339"]
title: "Langflow: OS command injection lets remote attackers run arbitrary code"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-agents", "ai-tooling", "langflow", "self-hosted"]
not_affected_if: ["version-outside-range"]
published_at: "2026-10-29T16:17:44+00:00"
first_seen_at: "2026-10-29T16:25:54+00:00"
updated_at: "2026-10-29T16:27:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104339", "first_seen_at": "2026-10-29T16:25:54+00:00"}]
---

# Langflow: OS command injection lets remote attackers run arbitrary code

IBM Langflow OSS versions 1.0.0 through 1.12.3 fail to neutralize special elements in input passed to an operating system command. A remote attacker can use this to execute arbitrary code on the server running Langflow.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Langflow version, for example with `langflow --version` or `pip show langflow`, and see whether it falls within `1.0.0` through `1.12.3`.
- Confirm whether the Langflow instance is reachable from the internet or an untrusted network.

## Fix

- Move to a Langflow OSS release newer than `1.12.3`; the exact fixed version is unknown from the sources.

## Timeline

- 2026-10-29T16:25:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-104339

## From the sources

IBM Langflow OSS 1.0.0 through 1.12.3 could allow a remote attacker to execute arbitrary code due to improper neutralization of special elements used in an OS command.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_