# CVE-2026-96297: MongoDB Server may disclose process memory via a crafted `$_internalApplyOplogUpdate` aggregation pipeline

CVE-2026-96297 is fixed in MongoDB on 1 platform by MongoDB 9.0.2 (version 9.0.2), released September 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-96297
- Priority: Routine
- CVSS: 6.0
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 13, 2026
- Weakness: CWE-416: Use after free
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-96297

## Description

Use of freed memory in the aggregation feature of MongoDB Server can cause the server to read data from a memory area after it has been released. When an internal aggregation stage is combined with a batch size of 0, the server may read from memory that is no longer in use. Because that memory can be reused for other data before it is read, query results returned to the client may contain unrelated data from the server process. Depending on the state of memory at the time, the server process may also terminate unexpectedly. The behavior can occur when an authenticated user with read privileges runs an aggregate command that combines these two settings.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | MongoDB | 9.0.2 | [MongoDB 9.0.2](https://patchblox.com/security/data/fix/windows-app/mongodb.server-9.0.2.md) | Sep 21, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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