---
id: "CVE-2026-104308"
kind: "vulnerability"
aliases: ["CVE-2026-104308"]
title: "Langflow: authenticated OS command injection enables denial of service"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-tooling", "langflow", "python", "self-hosted"]
not_affected_if: ["managed-hosting", "no-user-accounts"]
published_at: "2026-10-29T16:17:43+00:00"
first_seen_at: "2026-10-29T16:25:54+00:00"
updated_at: "2026-10-29T16:32:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104308", "first_seen_at": "2026-10-29T16:25:54+00:00"}]
---

# Langflow: authenticated OS command injection enables denial of service

IBM Langflow OSS versions 1.0.0 through 1.12.3 fail to neutralize special characters in an OS command, so a logged-in attacker can crash or disrupt the service. The sources describe the impact as denial of service only.

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

## How to check

- Check the installed Langflow version with `langflow --version` or the package listing for `langflow`; versions `1.0.0` through `1.12.3` are in range.
- Confirm whether the instance is reachable by users who hold accounts.

## Fix

- Move to a Langflow version later 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-2026-104308

## From the sources

IBM Langflow OSS 1.0.0 through 1.12.3 could allow a remote authenticated attacker to cause a denial of service due to improper neutralization of special elements used in an OS command.

---

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