MongoDB Crash via fromRouter:true and userRoles Aggregation Bug
CVE-2026-9747 Published on June 9, 2026
Crafted cross-shard merge aggregation crashes MongoDB Server
Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb server.
Vulnerability Analysis
CVE-2026-9747 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is an assertion failure Vulnerability?
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
CVE-2026-9747 has been classified to as an assertion failure vulnerability or weakness.
Products Associated with CVE-2026-9747
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Affected Versions
MongoDB Server:- Version 8.3.0 and below 8.3.3 is affected.
- Version 8.2.0 and below 8.2.10 is affected.
- Version 8.0.0 and below 8.0.24 is affected.
- Version 7.0.0 and below 7.0.35 is affected.