Unauthenticated Path Traversal in ComfyUI-Easy-Use Allows Remote Code Execution

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Summary

CVECVE-2026-123790
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-12 15:17:46 UTC
Updated2026-11-12 19:22:01 UTC
DescriptionComfyUI-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.

Risk And Classification

Problem Types: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ComfyUI-Easy-Use ComfyUI-Easy-Use affected 1.3.6 1.4.1 custom Not specified

References

ReferenceSourceLinkTags
github.com/yolain/ComfyUI-Easy-Use/commit/8a0f2fc412c1c6f9109e9392064800... [email protected] github.com
github.com/yolain/ComfyUI-Easy-Use [email protected] github.com
blog.nhhoang.io.vn/posts/2026/11/cve-2026-123790-comfyui-easy-use-save-preview-rce [email protected] blog.nhhoang.io.vn
www.kb.cert.org/vuls/id/944667 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
blog.nhhoang.io.vn MITRE blog.nhhoang.io.vn
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