Medium severity · published Jun 9, 2026
CVE-2026-9748
$_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.3.0 before 8.3.3; 8.2.0 before 8.2.10; 8.0.0 before 8.0.10; 7.0.0 before 7.0.35 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9748
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9748
Vendor Advisory
https://jira.mongodb.org/browse/SERVER-123951
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