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[BUG] @plotly/dash-jupyterlab extension failed to build in JupyterLab running on a JupyterHub server

Status: Open.

#3828 In plotly/dash;

· tlvu opened on Jun 18, 2026

[BUG] Dash with CSRFProtect from Flask-WTF no longer working after Dash 4.1 to 4.2 upgrade

Status: Open.

#3827 In plotly/dash;

· ghaarsma opened on Jun 17, 2026

WebSocket callback concurrency is bounded by an unconfigurable thread pool

dash-callbacksrelated to callbacksrelated to callbacks

performancesomething is slowsomething is slow

Status: Open.

#3825 In plotly/dash;

· ndrezn opened on Jun 17, 2026

[BUG] dash.testing ThreadedRunner.stop() hangs at teardown for Quart backend apps

Status: Open.

#3823 In plotly/dash;

· joschrag opened on Jun 17, 2026

[BUG] UnboundLocalError: user_callback_output in async background callbacks when callback raises an exception or PreventUpdate

Status: Open.

#3821 In plotly/dash;

· i-murray opened on Jun 16, 2026

[Feature Request] Avoid rendering dcc.Graph unless visible in the DOM

Status: Open.

#3820 In plotly/dash;

· ndrezn opened on Jun 16, 2026

[BUG] Callbacks double-registered when using uvicorn --reload under backend="fastapi"

Status: Open.

#3818 In plotly/dash;

· essol-li opened on Jun 15, 2026

[BUG] WebSocket callbacks do not expose request cookies/headers on callback_context

Status: Open.

#3814 In plotly/dash;

· i-murray opened on Jun 12, 2026

[BUG] RuntimeError: No active request in context on catchall route (FastAPI backend)

Status: Open.

#3812 In plotly/dash;

· WheatMaThink opened on Jun 10, 2026

[BUG] Patch update with relayoutData no longer working after Dash 4.1 to 4.2 upgrade

Status: Open.

#3810 In plotly/dash;

· ghaarsma opened on Jun 9, 2026

[BUG] Input Callback from RangeSlider incorrect if you move right slider on top of left

Status: Open.

#3786 In plotly/dash;

· dharzheim opened on May 15, 2026

[Feature Request] Customizing Document Title Per Callback

Status: Open.

#3782 In plotly/dash;

· justanothercoder99 opened on May 13, 2026