CVE-2026-9743 Aggregation sub-pipeline null dereference may allow DoS via crafted getMore

What is CVE-2026-9743?

CVE-2026-9743 is a high-severity 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

In MongoDB Server 8.0, an aggregation stage can leave its _subPipeline field null during processing of certain pipelines. If a getMore is subsequently issued on the same cursor, the server may dereference this null sub-pipeline when reattaching to the operation context, accessing an invalid address and crashing the process. This issue allows an authenticated user who can run aggregation pipelines to cause a denial of service by issuing a specially crafted aggregation followed by getMore on affected versions.

Weakness: CWE-476

Which versions are affected by CVE-2026-9743?

1 open source package ship an affected version, including mongodb. It affects 1 product.

Products include Mongodb Mongodb.

How do I fix CVE-2026-9743?

Upgrade mongodb to 8.0.24 or later.

Is CVE-2026-9743 being exploited?

There is no known exploitation of CVE-2026-9743 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 Exploited High 8.7
• CVE-2026-82067 Auth bypass in MongoDB Server Critical 9.2
• CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption Critical 9.2
• CVE-2017-15535 Denial of service in n/a Critical 9.1
• CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure Critical 9.0

All Mongodb Mongodb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-mongodb-2026-9743, GHSA-cmc7-vq67-x4pm, MINI-jm9g-c76x-6p35, UBUNTU-CVE-2026-9743.