BIT-MONGODB-2026-9748 $_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input

The $internalConvertBucketIndexStats stage used PauseExecution as a way to signal "skip this document" when an index stats conversion failed. But PauseExecution is not a general purpose skip mechanism, but rather a TeeBuffer-internal signal used solely by $facet to coordinate its sub-pipelines...

CVE-2026-9748

The CVE-2026-9748 issue affects MongoDB’s mongod when the $_internalConvertBucketIndexStats stage is used before $facet. It treats PauseExecution as an internal TeeBuffer signal rather than a general skip, causing an invariant assertion and a crash when processing no timeseries input. The descrip...