# CVE-2026-19371: Nikolaibibo claude-comfyui-mcp comfy_upload_image utils.ts copyFileSync path traversal

> Local attackers can exploit path traversal in the image upload utility to read or modify arbitrary files on the system.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Aug 2026
- **Updated:** 13 Aug 2026
- **Also known as:** GHSA-g57q-682f-hr5f

## What is CVE-2026-19371?

CVE-2026-19371 is a medium-severity path traversal vulnerability in Nikolaibibo claude-comfyui-mcp, published on 9 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was identified in Nikolaibibo claude-comfyui-mcp 1.0.0. Affected is the function copyFileSync of the file src/tools/utils.ts of the component comfy_upload_image. Such manipulation of the argument image_path leads to path traversal. An attack has to be approached locally. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-19371?


## How do I fix CVE-2026-19371?

No fix has been published for CVE-2026-19371 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19371 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19371 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19371 and fix it if it is affected.

What it is: CVE-2026-19371 is a medium-severity path traversal vulnerability in Nikolaibibo claude-comfyui-mcp, published on 9 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19371 exists.

Affected product: Nikolaibibo claude-comfyui-mcp. 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-2026-19371/ (Markdown: https://insights.sbomify.com/CVE-2026-19371/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19371
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19371
- OSV: https://osv.dev/vulnerability/CVE-2026-19371

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-19371/
Summaries are generated and may contain mistakes; the official description above is the record.