What’s Vulnerable › Vulnerabilities
CVE-2026-9743: Aggregation sub-pipeline null dereference may allow DoS via crafted getMore
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-09 · updated 2026-07-23
- Weakness: CWE-476
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.
Affected products
- MongoDB: from 8.0.0 before 8.0.24 — fixed in 8.0.24
How to fix
Upgrade to a fixed version: MongoDB 8.0.24. Check the vendor advisory for mitigations.
References
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