CVE-2026-9747: Crafted cross-shard merge aggregation crashes MongoDB Server
Published Jun 9, 2026
·Updated
Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb server.
Affected Software
1 affected component
MongoDB MongoDB Server
Event History
Jun 9, 2026
CVE Published
via MITRE·10:05 PM
Data Sourced
via MITRE·10:05 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·11:17 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What is the severity of CVE-2026-9747?
CVE-2026-9747 has a severity rating of medium, with a score of 6.5.
2
What impact does CVE-2026-9747 have on MongoDB Server?
CVE-2026-9747 can lead to crashes of the MongoDB Server during crafted cross-shard merge aggregations.
3
How do I mitigate CVE-2026-9747?
To mitigate CVE-2026-9747, avoid using fromRouter:true in aggregations until a patch is applied.
4
What versions of MongoDB are affected by CVE-2026-9747?
CVE-2026-9747 affects certain versions of MongoDB Server that utilize fromRouter:true and runtimeConstants.userRoles in aggregations.
5
Is there a patch available for CVE-2026-9747?
Yes, a patch is expected to be released to address CVE-2026-9747, so check for updates from MongoDB.