CVE-2026-9747 Crafted cross-shard merge aggregation crashes MongoDB Server
Crafted cross-shard merge aggregations can crash the MongoDB server, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9747?
CVE-2026-9747 is a high-severity denial of service vulnerability in Mongodb Mongodb, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb server.
Weakness: CWE-617
Which versions are affected by CVE-2026-9747?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 7.0.0 | 7.0.35, 8.0.24, 8.2.10, 8.3.3 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-9747?
Upgrade mongodb to a fixed version for your release line: 7.0.35, 8.0.24, 8.2.10 or 8.3.3.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-9747 being exploited?
There is no known exploitation of CVE-2026-9747 in the wild and no public exploit code.
Other vulnerabilities in Mongodb Mongodb
- CVE-2025-14847 MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency
- CVE-2026-82067 Auth bypass in MongoDB Server
- CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption
- CVE-2017-15535 Denial of service in n/a
- CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
Sources
Also known as BIT-mongodb-2026-9747, GHSA-43fh-5xpm-3q9m, MINI-52wg-mg9g-9633, MINI-cgcc-m7c3-gwxc, MINI-r4rf-hr6m-6w5g, MINI-wm28-26g9-h3pq and 1 more.