After updating the system to macOS 26.0 (25A354), the ComfyUI interface fails to load.

[litcatlay]

Prerequisites

• I am running the latest version of ComfyUI
• I have searched existing issues to make sure this isn't a duplicate
• I have tested with all custom nodes disabled (see how)

What happened?

After updating the system to macOS 26.0 (25A354), the ComfyUI interface fails to load.
The lsof results show that port 8000 is not occupied by any other unrelated programs.

Steps to Reproduce

How is this affecting you?

Crashes ComfyUI completely

ComfyUI Frontend Version

0.4.72 (2509101xbgkb7ux)

Browser

Chrome/Chromium

Console Errors

Logs

[2025-09-22 04:11:02.560] [info]  Using uv at /Applications/ComfyUI.app/Contents/Resources/uv/macos/uv
[2025-09-22 04:11:02.560] [info]  Install state: installed
[2025-09-22 04:11:02.561] [info]  Validating installation. Recorded state: [installed]
[2025-09-22 04:11:02.561] [info]  Running uv command directly: pip install --dry-run -r /Applications/ComfyUI.app/Contents/Resources/ComfyUI/requirements.txt
[2025-09-22 04:11:02.561] [info]  Running uv child process: uv pip install --dry-run -r /Applications/ComfyUI.app/Contents/Resources/ComfyUI/requirements.txt
[2025-09-22 04:11:02.561] [info]  Running command: /Applications/ComfyUI.app/Contents/Resources/uv/macos/uv pip install --dry-run -r /Applications/ComfyUI.app/Contents/Resources/ComfyUI/requirements.txt in /Users/pinkhide/Documents/ComfyUI
[2025-09-22 04:11:02.582] [info]  Running uv command directly: pip install --dry-run -r /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager/requirements.txt
[2025-09-22 04:11:02.582] [info]  Running uv child process: uv pip install --dry-run -r /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager/requirements.txt
[2025-09-22 04:11:02.582] [info]  Running command: /Applications/ComfyUI.app/Contents/Resources/uv/macos/uv pip install --dry-run -r /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager/requirements.txt in /Users/pinkhide/Documents/ComfyUI
[2025-09-22 04:11:02.603] [info]  Validation result: isValid:true, state:installed {"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}
[2025-09-22 04:11:02.953] [info]  Server start
[2025-09-22 04:11:02.958] [info]  Running command: /Users/pinkhide/Documents/ComfyUI/.venv/bin/python /Applications/ComfyUI.app/Contents/Resources/ComfyUI/main.py --user-directory /Users/pinkhide/Documents/ComfyUI/user --input-directory /Users/pinkhide/Documents/ComfyUI/input --output-directory /Users/pinkhide/Documents/ComfyUI/output --front-end-root /Applications/ComfyUI.app/Contents/Resources/ComfyUI/web_custom_versions/desktop_app --base-directory /Users/pinkhide/Documents/ComfyUI --extra-model-paths-config /Users/pinkhide/Library/Application Support/ComfyUI/extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8000 in /Users/pinkhide/Documents/ComfyUI
[2025-09-22 04:11:02.973] [info]  Received renderer-ready message!
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"skipped"}}
[2025-09-22 04:11:02.974] [info]  Sending queued message {"channel":"loading-progress","data":{"status":"starting-server"}}
[2025-09-22 04:11:12.006] [info]  Python server is ready
[2025-09-22 04:11:32.953] [error] @todesktop/runtime: alwaysResolve: Promise timed out after 30000ms
[2025-09-22 04:11:38.348] [info]  @todesktop/runtime: Checking for update
[2025-09-22 04:11:38.349] [info]  @todesktop/runtime: AutoUpdater: checking-for-update
[2025-09-22 04:11:49.426] [info]  @todesktop/runtime: Update for version 0.4.72 is not available (latest version: 0.4.72, downgrade is allowed).
[2025-09-22 04:11:49.426] [info]  @todesktop/runtime: AutoUpdater: update-not-available {"version":"0.4.72","files":[{"url":"ComfyUI 0.4.72 - Build 2509101xbgkb7ux-arm64-mac.zip","sha512":"MQYTwBIhMnJAAPWD0waHZsfp55Rg34kkv6fEasgGGbCtYPYVjoxEPiWmAV2qdBLyNrrYEh+epeJXHvdbA8+7PQ==","size":146441354},{"url":"ComfyUI 0.4.72 - Build 2509101xbgkb7ux-arm64.dmg","sha512":"EfM0/XkOgfypolxsXEBPmP74bj1vYDRy2ljxrGqHHE7t9qi6Y8jx5CLvdT8YiIxvRWH4bJ3pRTH7rolIVVmpaQ==","size":151567537}],"path":"ComfyUI 0.4.72 - Build 2509101xbgkb7ux-arm64-mac.zip","sha512":"MQYTwBIhMnJAAPWD0waHZsfp55Rg34kkv6fEasgGGbCtYPYVjoxEPiWmAV2qdBLyNrrYEh+epeJXHvdbA8+7PQ==","releaseDate":"2025-09-10T22:21:34.852Z"}

Additional Context

No response

┆Issue is synchronized with this Notion page by Unito

[dosubot]

Hi @litcatlay! I'm Dosu and I’m helping the ComfyUI_frontend team.

There aren’t any known issues or fixes for ComfyUI failing to load on macOS 26.0, and nothing in the codebase or recent updates directly addresses this scenario. The logs show the backend starts and validates successfully, but the error @todesktop/runtime: alwaysResolve: Promise timed out after 30000ms suggests a problem with the desktop runtime’s communication or startup handshake, possibly triggered by changes in macOS 26.0’s environment or permissions.

No frontend JavaScript errors appear, and similar issues reported on other platforms (like Windows) were resolved by adjusting environment or security settings, but there’s no direct macOS equivalent documented yet (#4860). There’s also no relevant documentation or troubleshooting for macOS 26.0 compatibility found on the official site.

If you haven’t already, check for crash reports or system logs in Console.app or the macOS crash reporter—these might reveal if the runtime or Python backend is being blocked or terminated by the OS. You could also try running the backend manually from Terminal to see if it launches and responds on port 8000, or test with a different browser to rule out rendering issues. If you find any additional error logs or crash details, sharing those could help pinpoint the failure.

To reply, just mention @dosu.

---

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[litcatlay]

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ComfyUI 4171 pinkhide 23u IPv4 0x23c9b9a7a191f46 0t0 TCP localhost:49268->localhost:irdmi (ESTABLISHED)
ComfyUI 4171 pinkhide 28u IPv4 0xda52ef66eaaafb82 0t0 TCP localhost:49271->localhost:irdmi (ESTABLISHED)
ComfyUI 4171 pinkhide 30u IPv4 0xeb3ac501fc16e996 0t0 TCP localhost:49270->localhost:irdmi (ESTABLISHED)
ComfyUI 4171 pinkhide 79u IPv4 0x8628261cdf8ba70d 0t0 TCP localhost:49273->localhost:irdmi (ESTABLISHED)
python3.1 4184 pinkhide 22u IPv4 0x31f4c677b96de409 0t0 TCP localhost:irdmi (LISTEN)
python3.1 4184 pinkhide 25u IPv4 0x29eb5c74aa2a4934 0t0 TCP localhost:irdmi->localhost:49268 (ESTABLISHED)
python3.1 4184 pinkhide 27u IPv4 0xbfa20423a40afb1c 0t0 TCP localhost:irdmi->localhost:49270 (ESTABLISHED)
python3.1 4184 pinkhide 28u IPv4 0xff1f1cc89e8f96c0 0t0 TCP localhost:irdmi->localhost:49271 (ESTABLISHED)
python3.1 4184 pinkhide 29u IPv4 0xa96a004faad5f5d6 0t0 TCP localhost:irdmi->localhost:49273 (ESTABLISHED)

[webfiltered]

Hi there, can you please upload both your main.log and comfy logs? You can find details on the bug report template on the desktop repo: https://github.com/Comfy-Org/desktop/issues

[litcatlay]

Hi there, can you please upload both your main.log and comfy logs? You can find details on the bug report template on the desktop repo: https://github.com/Comfy-Org/desktop/issues你好，请上传你的 main.log 和 comfy 日志。你可以在桌面仓库的 Bug 报告模板中找到详细信息：https://github.com/Comfy-Org/desktop/issues

Hello~ The log is here.
I can render the GUI normally when using the browser to load it.

comfyui.log

main.log