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

CVE-2026-9748

$_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input PUBLISHED

Description (CNA)

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. When this stage is placed before $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod.

Affected (CNA)

Vendor / product	Versions
MongoDB / MongoDB Server	affected 8.3.0 before 8.3.3; affected 8.2.0 before 8.2.10; affected 8.0.0 before 8.0.10; affected 7.0.0 before 7.0.35

CWE

CWE-617

References

https://jira.mongodb.org/browse/SERVER-123951

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.