---
id: "CVE-2026-123790"
page: "https://infrastack.ai/live/CVE-2026-123790"
kind: "vulnerability"
aliases: ["CVE-2026-123790"]
title: "ComfyUI-Easy-Use: unauthenticated path traversal lets attackers plant code in custom nodes"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: [{"name": "ComfyUI-Easy-Use", "fixed": [], "affected": "1.3.6", "ecosystem": "pip"}]
ecosystems: []
tags: ["ai-tooling", "comfyui", "comfyui-easy-use", "no-fix", "python", "self-hosted"]
not_affected_if: ["auth-required", "extension-not-installed", "localhost-only", "no-easy-use-node", "server-not-reachable"]
published_at: "2026-11-12T15:17:46+00:00"
first_seen_at: "2026-11-12T15:41:57+00:00"
updated_at: "2026-11-12T15:44:45+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123790", "first_seen_at": "2026-11-12T15:41:57+00:00"}, {"source": "analyst", "url": "https://kb.cert.org/vuls/id/944667", "first_seen_at": "2026-11-12T15:44:45+00:00", "cites": ["https://kb.cert.org/vuls/id/944667"]}]
exploit_sources: []
---

# ComfyUI-Easy-Use: unauthenticated path traversal lets attackers plant code in custom nodes

Link for people: https://infrastack.ai/live/CVE-2026-123790 (this .md is for agents)

ComfyUI-Easy-Use 1.3.6 has a path traversal flaw in the save_preview() handler at POST /easyuse/save/{name}, which lets a request pick the custom_nodes directory as a copy destination. An unauthenticated attacker who can reach the ComfyUI server can overwrite an installed custom node's Python entry point, and the attacker's code runs with ComfyUI's privileges after a restart.

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

## Affected

- pip:ComfyUI-Easy-Use affected 1.3.6 fixed no fixed version listed

## How to check

Look for ComfyUI/custom_nodes/ComfyUI-Easy-Use and read its version (1.3.6 is the confirmed vulnerable one; other versions are untested, not known safe). Check whether the ComfyUI port is reachable from untrusted networks (default bind is 127.0.0.1). Also check custom_nodes/*/__init__.py for unexpected changes and the input directory for stray .py files.

## Fix

No fixed version known as of 2026-11-12: CERT/CC says the ComfyUI-Easy-Use maintainer could not be reached. Only 1.3.6 is confirmed vulnerable (by the reporter). Remove the extension or restrict network access to ComfyUI.

## Timeline

- 2026-11-12T15:41:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123790
- 2026-11-12T15:44:45+00:00 analyst https://kb.cert.org/vuls/id/944667 — CERT/CC VU#944667 (published 2026-11-12) is the only source: no vendor advisory, maintainer unreachable, no fix, no PoC or exploitation reported. Not verified: CERT's page is not the maintainer's own words. NVD page was empty. X not checked.

## Documents

- [advisory] VU#944667 ComfyUI-Easy-Use unauthenticated path traversal (CERT/CC) https://kb.cert.org/vuls/id/944667

## From the sources

ComfyUI-Easy-Use version 1.3.6 contains a path traversal vulnerability in the `save_preview()` handler for POST `/easyuse/save/{name}`. The handler checks the source directory before appending a user-supplied filename and allows the request to select the `custom_nodes` directory as a copy destination. An unauthenticated attacker who can reach the ComfyUI server can overwrite an installed custom node’s Python entry point with an uploaded file. When ComfyUI restarts and loads the modified node, the attacker’s code runs with the privileges of the ComfyUI process.

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