# CVE-2026-19371 — Nikolaibibo claude-comfyui-mcp

> As of 2026-08-09, CVE-2026-19371 is a MEDIUM-severity vulnerability in Nikolaibibo claude-comfyui-mcp, CVSS v3.1 5.3, EPSS 0.1% (3.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-19371 as of 2026-08-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-09

## What is CVE-2026-19371?

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.

The record classifies CVE-2026-19371 under weakness class [CWE-22](https://intel.threadlinqs.com/cwe/CWE-22). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 57 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.3 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 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`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 3.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-09

## Is CVE-2026-19371 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Nikolaibibo**: claude-comfyui-mcp

## How to fix CVE-2026-19371

No vendor patch reference has been recorded for CVE-2026-19371 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-19371

No threat campaign in the Threadlinqs corpus currently references CVE-2026-19371, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-11.

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/387255)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/387255/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-19371)
- [vuldb.com — third party advisory (866269)](https://vuldb.com/submit/866269)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/Nikolaibibo/claude-comfyui-mcp/issues/3)
- [github.com — product](https://github.com/Nikolaibibo/claude-comfyui-mcp/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-19371
Full detection coverage and IOCs for threats exploiting CVE-2026-19371 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp