Comfy-Org ComfyUI up to 0.27.x Model Manager app/model_manager.py get_model_preview filename path traversal

Summaryinfo

A vulnerability classified as problematic was found in Comfy-Org ComfyUI up to 0.27.x. Affected by this vulnerability is the function get_model_preview of the file app/model_manager.py of the component Model Manager. Executing a manipulation of the argument filename can lead to path traversal. This vulnerability is registered as CVE-2026-56671. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Comfy-Org ComfyUI up to 0.27.x. It has been declared as problematic. This vulnerability affects the function get_model_preview of the file app/model_manager.py of the component Model Manager. The manipulation of the argument filename with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

ComfyUI is a modular diffusion model GUI, api and backend with a graph/nodes interface. Prior to 0.28.0, get_model_preview in app/model_manager.py joins an unrestricted filename route capture to a selected model directory without a containment check, allowing an unauthenticated remote attacker to use traversal, encoded traversal, absolute paths, or an unbounded path_index to read image-decodable files and enumerate host paths. get_model_preview (app/model_manager.py) built the path with os.path.join(folder, filename) where filename is an unrestricted {filename:.*} route capture. Literal ../, percent-encoded %2e%2e%2f, and absolute paths all escaped the model directory; path_index was also unbounded. The target file is piped through Pillow and re-encoded as WEBP, so disclosure is limited to image-decodable files plus a file-existence/enumeration oracle (and internal-path leakage via path_index errors). This issue is fixed in version 0.28.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-56671 since 06/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 0.28.0 eliminates this vulnerability.

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Productinfo

Vendor

• Comfy-Org

Name

• ComfyUI

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27

Website

• Product: https://github.com/Comfy-Org/ComfyUI/

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