CVE-2026-5170 Users could trigger a crash of mongod primaries during promotion to sharded
A user with limited privileges can crash the primary database node during cluster promotion, 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-2026-5170?
CVE-2026-5170 is a medium-severity denial of service vulnerability in Mongodb Mongodb, published on 30 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A user with access to the cluster with a limited set of privilege actions can trigger a crash of a mongod process during the limited and unpredictable window when the cluster is being promoted from a replica set to a sharded cluster. This may cause a denial of service by taking down the primary of the replica set.
This issue affects MongoDB Server v8.2 versions prior to 8.2.2, MongoDB Server v8.0 versions between 8.0.18, MongoDB Server v7.0 versions between 7.0.31.
Weakness: CWE-617
Which versions are affected by CVE-2026-5170?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 7.0.0 | 7.0.31, 8.0.18, 8.2.2 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-5170?
Upgrade mongodb to a fixed version for your release line: 7.0.31, 8.0.18 or 8.2.2.
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-2026-5170 being exploited?
There is no known exploitation of CVE-2026-5170 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-2026-5170, GHSA-qg39-5q45-4gcc, MINI-f9hp-qm5w-rrv7, MINI-xf49-35j4-5rh6, UBUNTU-CVE-2026-5170.