Vulnerability · Published Aug 9, 2026 · Assigned by VulDB

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

Medium 5.3

In plain English

A medium-severity path traversal in claude-comfyui-mcp from Nikolaibibo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 90.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Nikolaibibo	claude-comfyui-mcp	1.0.0

Weakness: CWE-22 · Vector: 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

References

VDB-387255 | Nikolaibibo claude-comfyui-mcp comfy_upload_image utils.ts copyFileSync path traversal vdb-entry, technical-description
VDB-387255 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-19371 | CVE Analysis and Report third-party-advisory
Submit #866269 | Nikolaibibo claude-comfyui-mcp 1.0.0 Path Traversal third-party-advisory
https://github.com/Nikolaibibo/claude-comfyui-mcp/issues/3 issue-tracking
https://github.com/Nikolaibibo/claude-comfyui-mcp/ product