CVE-2026-9743
Aggregation sub-pipeline null dereference may allow DoS via crafted getMore
- State
- Published
- Severity
- 7.1 High
- Published
- Jun 9, 2026
- Updated
- Jun 10, 2026
- Reserved
- May 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | mongodb |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | mongodb |
Weaknesses
- CWE-476 NULL pointer dereference
Affected Products
| Product | Versions |
|---|---|
MongoDB serverMongoDB |
|
References
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