How to reproduce:
1. Create a new project or open any project
2. Import the attached file “octahedron.obj“

Expected result: File is imported
Actual result: Unity crashes

Reproducible with: 2020.3.45f1, 2021.3.18f1, 2022.2.6f1, 2023.1.0b3, 2023.2.0a1

Reproduced on: macOS 13.0.1 (Intel)

Note: Unity doesn’t crash if the file is converted to the .fbx format before importing

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This bug was introduced during a recent update of the FBX SDK. The SDK is owned and built by Autodesk and they decide when to release a new version.

We found a fix and sent it to them but we don't know when they'll make it available.

We will publish this as soon as we get it but this is sadly out of our control.

Thank you and really sorry about the inconvenience