CVE-2026-8843 Calling createIndex with certain index types can crash mongod
Attackers can crash the MongoDB server by inserting documents into collections with specific malformed index types, 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-2026-8843?
CVE-2026-8843 is a high-severity denial of service vulnerability in Mongodb Mongodb, published on 18 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Creating a "2dsphere_bucket" index on a non-timeseries bucket collection will succeed, but any subsequent attempt to insert a document which triggers updating that index will crash the server. A similar issue occurs when creating "queryable_encrypted_range" indices.
This issue affects MongoDB Server v7.0 versions prior to 7.0.32, v8.0 versions prior to 8.0.21 and v8.2 versions prior to 8.2.6
Weakness: CWE-617
Which versions are affected by CVE-2026-8843?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 7.0.0 | 7.0.32, 8.0.21, 8.2.6 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-8843?
Upgrade mongodb to a fixed version for your release line: 7.0.32, 8.0.21 or 8.2.6.
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-2026-8843 being exploited?
There is no known exploitation of CVE-2026-8843 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-2026-8843, GHSA-v7q4-vccc-3jxg, MINI-5v3q-pfqw-c9jg, MINI-qpm5-9hmh-f2vf, UBUNTU-CVE-2026-8843.