# CVE-2026-123790: Unauthenticated Path Traversal in ComfyUI-Easy-Use Allows Remote Code Execution

> Unauthenticated attackers can overwrite a custom node's Python entry point via path traversal and run code on ComfyUI servers using Easy-Use.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Harmful if only installed:** No
- **Needs a specific call:** No
- **Fix available:** No
- **Published:** 12 Nov 2026
- **Updated:** 12 Nov 2026
- **Also known as:** GHSA-25xv-w465-qr9f

## What is CVE-2026-123790?

CVE-2026-123790 is a path traversal vulnerability in ComfyUI-Easy-Use, published on 12 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

## Which versions are affected by CVE-2026-123790?

An affected version is exposed as installed. No special setting or call is needed.


## How do I fix CVE-2026-123790?

No fix has been published for CVE-2026-123790 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-123790 being exploited?

There is no known exploitation of CVE-2026-123790 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123790 and fix it if it is affected.

What it is: CVE-2026-123790 is a path traversal vulnerability in ComfyUI-Easy-Use, published on 12 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-123790 in the wild and no public exploit code.
Exposure: An affected version is exposed as installed. No special setting or call is needed.

Affected product: ComfyUI-Easy-Use. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-123790/ (Markdown: https://insights.sbomify.com/CVE-2026-123790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123790
- OSV: https://osv.dev/vulnerability/CVE-2026-123790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-123790/
Summaries are generated and may contain mistakes; the official description above is the record.