CVE-2026-9748

MEDIUM

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

Title source: cna

Description

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 6.5

EPSS 0.0029

EPSS Percentile 20.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-617

Status published

Products (5)

mongodb/mongodb 7.0.0 - 7.0.35

MongoDB/MongoDB Server 7.0.0 - 7.0.35

MongoDB/MongoDB Server 8.0.0 - 8.0.10

MongoDB/MongoDB Server 8.2.0 - 8.2.10

MongoDB/MongoDB Server 8.3.0 - 8.3.3

Published Jun 09, 2026

Tracked Since Jun 10, 2026