CVE-2026-9748: MongoDB

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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 products

• MongoDB MongoDB: from 7.0.0, before 7.0.35 (fixed in 7.0.35); from 8.0.0, before 8.0.10 (fixed in 8.0.10); from 8.2.0, before 8.2.10 (fixed in 8.2.10); from 8.3.0, before 8.3.3 (fixed in 8.3.3)

Published 2026-06-09. Last modified 2026-07-23.