6000.6.8f1

Supported · Released Nov 3, 2026 · Changeset 237b6593792b · 11 release notes

Unity 6.6 feature guideUnity release pageRelease notes (markdown) Open in Unity Hub
65build score
Upgrade risk+26Net cleanup+22Live debt+17
cohort: Update/Supported (69)
How this number is computed

Composite = sum of sub_score × weight across six metrics. Sub-scores are percentile-rank(log1p(min(raw, p95))) within the Update/Supported cohort (69 releases). Sub-scores for lower-is-better metrics are flipped to 100 − percentile.

Sub-scoreFormulaRawClip%ileWeightScoreContrib
Breaking surface(breaking_change + api_change) / total_notes8.8e-38.8e-36225%389.6
Blocker rateblockers / total_notes0.0350.0351815%8212.3
Mobile riskmobile_known_issues / total_notes0.0180.0185610%444.4
Fix densityfixes / total_notes0.798*0.7959715%9714.6
Net-fix delta((fixes − known_issues) − prior.(fixes − known_issues)) / total_notes0.0530.0534915%497.3
Known-issue debtknown_issues / total_notes0.0960.0961520%8517.0
Composite65

* = raw value was clipped at the cohort 95th percentile to prevent outliers from compressing everyone else's scores. Sub-scores marked "med" substitute the cohort median where the input was missing (e.g. first patch on a minor line has no prior patch for net-fix delta).

Silent crash when launching a project from an external drive with exFAT formatting
Linked bug report
UUM-156738: Silent crash when launching a project from an external drive with exFAT formatting

How to reproduce: Create and open a new project on an external drive formatted as exFAT using the “Universal 3D” template Observe the crash Reproducible with: 6000.6.0a4 (d203f4c2ae2f), 6000.6.6f1, 6000.7.0b5, 7000.0.0a8 Not reproducible with: 6000.0.85f1, 6000.3.26f1, 6000.6.0a3 Reproducible on: macOS 27.0 (M4 Max) Not reproducible on: No other environments tested Notes: a “libc++abi: termina…

Retrieved 2026-11-10
Asset - DatabaseKnown issueBlockerUUM-156738
Crash with multiple stack traces when the main thread resumes after a USB audio output device is disconnected and reconnected
Linked bug report
UUM-158166: Crash with multiple stack traces when the main thread resumes after a USB audio output device is disconnected and reconnected

How to reproduce: Use a USB audio device as the only audio output Disable all other outputs in Windows Sound settings menu Open the attached “IN-158022” project Open the “Assets/AdtmRepro/AdtmRepro.unity” scene In the Menu bar, select “Repro → ADTM -> Log Audio State” Unplug the USB audio device Enter and exit Play mode several times, until the Console logs “FMOD failed to switch back to norma…

Retrieved 2026-11-10
Audio AuthoringKnown issueBlockerUUM-158166
Crash on UnityEngine.Serialization.SerializationBackendManagedCommands:ExecuteV2WriteStream when using typeof(T) in ISerializationCallbackReceiver.OnBeforeSerialize() of a struct<T>
Linked bug report
UUM-155957: Crash on UnityEngine.Serialization.SerializationBackendManagedCommands:ExecuteV2WriteStream when using typeof(T) in ISerializationCallbackReceiver.OnBeforeSerialize() of a struct<T>

How to reproduce: Open the attached “IN-155447” project Open the “TestCrash” scene Select the “TestCrash” GameObject in the Hierarchy Observe the crash Reproducible with: 6000.6.0a7, 6000.6.5f1, 6000.7.0b3 (d45e8f6ab798), 7000.0.0a1 Not reproducible with: 6000.0.84f1, 6000.3.26f1, 6000.6.0a6 Could not test with: 7000.0.0a2, 7000.0.0a4 (development versions) Fixed in: 7000.0.0a5 Reproducible on…

Retrieved 2026-11-10
SerializationKnown issueBlockerUUM-155957
Crash on HierarchyGameObjectHandler::AddOrUpdateNodeTransformCallback when having Colliders on parent and child GameObjects and removing a Layout Group Component from the parent
Linked bug report
UUM-157935: Crash on HierarchyGameObjectHandler::AddOrUpdateNodeTransformCallback when having Colliders on parent and child GameObjects and removing a Layout Group Component from the parent

How to reproduce: Create a project of any type and make sure uGUI is installed Create an empty GameObject Drag the newly created GameObject to the Project window to create a Prefab Open the newly created Prefab Add a child GameObject with any type of Collider Add any type of Collider to the root GameObject Add any type of Layout Group Component to the root GameObject Undo the last change using…

Retrieved 2026-11-11
uGUI ControlsKnown issueBlockerUUM-157935

Pick your Unity version

Unity Releases compares releases against the version your project is on. Picking it now keeps Compare versions focused on what changes between where you are and where you might be going.