HOME-ASSISTANT-2026.9.1 release notes and known issues

Summary

Fix SMTP attaching valid images as files when content sniffing fails ( @Chang-Jin-Lee - #176774 ) ([smtp docs]) Warn that removing an app deletes its data in repair flows ( @agners - #181009 ) ([hassio docs]) Fix receive backup streaming ( @MartinHjelmare - #181012 ) ([backup docs]) Fix potential deadlock in receive_file backup util ( @emontnemery - #181070 ) ([backup docs]) Add missing state_class for miele filling level sensors ( @astrandb - #181093 ) ([miele docs]) Update python-roborock to 7.2.3 ( @Lash-L - #181096 ) ([roborock docs]) Bump vizaio to 0.6.1 for vizio state_extended 404 fallback fix ( @raman325 - #181131 ) ([vizio docs]) (dependency) Stop rounding Amber Electric prices to 2 decimal places ( @romeovan - #181157 ) ([amberelectric docs]) Fix host override ignored in UniFi Protect public-only mode ( @RaHehl - #181176 ) ([unifiprotect docs]) Purge unreachable deleted devices on device registry load ( @emontnemery - #181207 ) Bump pydaikin to 2.19.1 (hotfix) ( @GhislainC - #181219 ) ([daikin docs]) (dependency) Fix Besen config flow schema serialization ( @moryoav - #181223 ) ([besen docs]) Speed up lookup of colliding orphans in device registry ( @arturpragacz - #181244 ) Revert orjson to 3.11.9 ( @emontnemery - #181245 ) (dependency) Bump aioflo to 2026.9.3 and scope Flo consumption by device ( @BradKollmyer - #181246 ) ([flo docs]) Bump serialx to 1.10.0 ( @puddly - #181249 ) ([serial docs]) ([usb docs]) Bump env-canada to 0.19.2 ( @michaeldavie - #181250 ) ([environment_canada docs]) (dependency) Bump python-hotspring to 2.1.0 (hotfix) ( @Moustachauve - #181256 ) ([hotspring docs]) (dependency) Bump samsung-exlink to 1.1.1 ( @balloob - #181260 ) ([samsung_exlink docs]) (dependency) Reject Hot Spring Spa Network Adapter (SNA) in config flow (hotfix) ( @Moustachauve - #181261 ) ([hotspring docs]) Update knx-frontend to 2026.9.4.63549 ( @farmio - #181268 ) ([knx docs]) (dependency) Allow empty motionEye usernames ( @frenck - #181270 ) ([motioneye docs]) Handle Tradfri devices without a firmware version ( @frenck - #181276 ) ([tradfri docs]) Update frontend to 20260826.6 ( @bramkragten - #181293 ) ([frontend docs]) (dependency) Bump reolink_aio to 0.21.15 ( @starkillerOG - #181300 ) ([reolink docs]) (dependency) Bump pylitterbot to 2025.6.5 ( @natekspencer - #181346 ) ([litterrobot docs]) (dependency) Bump uiprotect to 16.6.1 ( @RaHehl - #180670 ) ([unifiprotect docs]) (dependency)

Improvements and security content

• Fix SMTP attaching valid images as files when content sniffing fails ( @Chang-Jin-Lee - #176774 ) ([smtp docs]) Warn that removing an app deletes its data in repair flows ( @agners - #181009 ) ([hassio docs]) Fix receive backup streaming ( @MartinHjelmare - #181012 ) ([backup docs]) Fix potential deadlock in receive_file backup util ( @emontnemery - #181070 ) ([backup docs]) Add missing state_class for miele filling level sensors ( @astrandb - #181093 ) ([miele docs]) Update python-roborock to 7.2.3 ( @Lash-L - #181096 ) ([roborock docs]) Bump vizaio to 0.6.1 for vizio state_extended 404 fallback fix ( @raman325 - #181131 ) ([vizio docs]) (dependency) Stop rounding Amber Electric prices to 2 decimal places ( @romeovan - #181157 ) ([amberelectric docs]) Fix host override ignored in UniFi Protect public-only mode ( @RaHehl - #181176 ) ([unifiprotect docs]) Purge unreachable deleted devices on device registry load ( @emontnemery - #181207 ) Bump pydaikin to 2.19.1 (hotfix) ( @GhislainC - #181219 ) ([daikin docs]) (dependency) Fix Besen config flow schema serialization ( @moryoav - #181223 ) ([besen docs]) Speed up lookup of colliding orphans in device registry ( @arturpragacz - #181244 ) Revert orjson to 3.11.9 ( @emontnemery - #181245 ) (dependency) Bump aioflo to 2026.9.3 and scope Flo consumption by device ( @BradKollmyer - #181246 ) ([flo docs]) Bump serialx to 1.10.0 ( @puddly - #181249 ) ([serial docs]) ([usb docs]) Bump env-canada to 0.19.2 ( @michaeldavie - #181250 ) ([environment_canada docs]) (dependency) Bump python-hotspring to 2.1.0 (hotfix) ( @Moustachauve - #181256 ) ([hotspring docs]) (dependency) Bump samsung-exlink to 1.1.1 ( @balloob - #181260 ) ([samsung_exlink docs]) (dependency) Reject Hot Spring Spa Network Adapter (SNA) in config flow (hotfix) ( @Moustachauve - #181261 ) ([hotspring docs]) Update knx-frontend to 2026.9.4.63549 ( @farmio - #181268 ) ([knx docs]) (dependency) Allow empty motionEye usernames ( @frenck - #181270 ) ([motioneye docs]) Handle Tradfri devices without a firmware version ( @frenck - #181276 ) ([tradfri docs]) Update frontend to 20260826.6 ( @bramkragten - #181293 ) ([frontend docs]) (dependency) Bump reolink_aio to 0.21.15 ( @starkillerOG - #181300 ) ([reolink docs]) (dependency) Bump pylitterbot to 2025.6.5 ( @natekspencer - #181346 ) ([litterrobot docs]) (dependency) Bump uiprotect to 16.6.1 ( @RaHehl - #180670 ) ([unifiprotect docs]) (dependency)

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