---
id: "CVE-2026-104324"
kind: "vulnerability"
aliases: ["CVE-2026-104324"]
title: "Langflow: untrusted data deserialization lets an authenticated user run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-tooling", "langflow", "python", "self-hosted"]
not_affected_if: ["no-remote-login", "versions-outside-range"]
published_at: "2026-10-29T16:17:44+00:00"
first_seen_at: "2026-10-29T16:25:54+00:00"
updated_at: "2026-10-29T16:29:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104324", "first_seen_at": "2026-10-29T16:25:54+00:00"}]
---

# Langflow: untrusted data deserialization lets an authenticated user run code

IBM Langflow OSS versions 1.0.0 through 1.12.3 deserialize untrusted data without checks. A remote attacker with a valid account can use this to execute arbitrary code on the server.

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

## How to check

- Check the installed version with `pip show langflow` or `langflow --version`; versions 1.0.0 through 1.12.3 are affected.
- Confirm whether the instance is reachable from the internet or only from a trusted network.

## Fix

- Move to a Langflow OSS release newer than `1.12.3`; the sources do not name the exact fixed version.

## Timeline

- 2026-10-29T16:25:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-104324

## From the sources

IBM Langflow OSS 1.0.0 through 1.12.3 could allow a remote authenticated attacker to execute arbitrary code due to deserialization of untrusted data.

---

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