iOS 26.4 CarPlay crash when presenting CPMapTemplate on real devices and simulator

[Valwars]

We are seeing a reproducible CarPlay crash on iOS 26.4 when presenting the CarPlay map root through @iternio/react-native-auto-play.

Summary

• This worked on iOS 26.0
• It crashes on iOS 26.4
• We can reproduce it on both the iOS 26.4 simulator and real devices
• The crash seems to happen specifically when the CarPlay map template is presented

Native crash symptom

The native crash consistently points to Apple CarPlay internals around the map template share button:

• CPSMapTemplateViewController _updateShareButtonVisibility
• CPSMapTemplateViewController _configureNavigationBarShareButton

We also saw this runtime exception:

-[CPSTemplateInstance vehicleSupportsDestinationSharing]: unrecognized selector sent to instance

This makes it look like an iOS 26.4 CarPlay / CPMapTemplate regression, possibly related to destination sharing / route sharing behavior introduced there.

Versions

App:

• app version: 4.0.11

CarPlay:

• @iternio/react-native-auto-play: 0.3.5

Mapbox:

• @rnmapbox/maps: ^10.3.0
• iOS MapboxMaps: 11.18.3
• iOS MapboxCoreMaps: 11.18.3
• iOS MapboxCommon: 24.18.3

React Native / Expo:

• expo: ~55.0.11
• react-native: 0.83.4
• react-native-nitro-modules: ^0.35.3

Notes

At this point I am not sure whether this should be fixed in the library or whether it is purely an Apple iOS 26.4 regression in CarPlay.

But I wanted to report it here because other teams using react-native-auto-play for CarPlay navigation may hit the same issue.

[g4rb4g3]

I've checked sentry on our side and we do not see anything like that. Also there are no user reports referring to iOS 26.4 troubles matching this.
Can you reproduce this with the example app? If so can you provide a full stack trace and a fork providing code?
I've checked the CarPlay docs and can not find a single bit on the mentioned share button or destination sharing...

[Valwars]

I can now reproduce the issue with the official example app as well.

Summary

• The crash is reproducible with the upstream example app
• The example app had no issue on iOS 18 before
• The crash happens on iOS 26.4 when opening CarPlay
• This makes it very unlikely that the issue is specific to my app code

Why I believe this is the same issue

The native crash pattern matches what I was seeing in my app:

• process: CarPlayTemplateUIHost
• exception: EXC_CRASH (SIGABRT)
• same CarPlay internal frames:
  • CPSMapTemplateViewController _updateShareButtonVisibility
  • CPSMapTemplateViewController _configureNavigationBarShareButton
  • CPSMapTemplateViewController _viewDidLoad

In my app, I had previously also seen:

• -[CPSTemplateInstance vehicleSupportsDestinationSharing]: unrecognized selector sent to instance

That exact selector is not shown in this latest example-app crash report, but the crash is still happening in the same internal CarPlay map-template code path, around share button visibility.

Important point

The example app does not include my application-specific code, and it also does not depend on the same app logic as my project.

So at this point the issue looks like either:

• an Apple iOS 26.4 regression in CPMapTemplate
• or a react-native-auto-play code path that triggers this Apple runtime issue

Reproduction context

• official example app from this repository
• simulator: iPhone 17
• iOS: 26.4
• CarPlay opened from the simulator environment

Conclusion

This does not appear to be app-specific anymore.

The upstream example app worked fine before on iOS 18, but crashes on iOS 26.4 with the same CarPlay internal stack pattern, which strongly suggests a platform/runtime regression or an incompatibility exposed by the current CarPlay map-template flow.
error.txt

[g4rb4g3]

I don't see anything related to the example app on that stack trace and I can't reproduce the issue either. Most likely it is another CarPlay simulator issue then, I've seen a few from showing only a black screen to crashes when starting a navigation session. I think you should file an Apple Feedback instead.

[Valwars]

I don't see anything related to the example app on that stack trace and I can't reproduce the issue either. Most likely it is another CarPlay simulator issue then, I've seen a few from showing only a black screen to crashes when starting a navigation session. I think you should file an Apple Feedback instead.

Thanks for your feedback! I’ll dig into that direction and check the simulator / Apple Feedback side 👍