# CVE-2026-103965: Fixed values in MongoDB Server $bucket stage may be misread as field references

CVE-2026-103965 is fixed in MongoDB on 1 platform by MongoDB 9.0.4 (version 9.0.4), released October 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-103965
- Priority: Routine
- CVSS: 5.3
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 13, 2026
- Weakness: CWE-94: Improper Control of Generation of Code ('Code Injection')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-103965

## Description

An issue in MongoDB Server's aggregation framework can cause certain constant values to be handled incorrectly during internal query rewriting. Under certain conditions, an authenticated user with read access may receive field values in aggregation output that the query did not intend to return.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | MongoDB | 9.0.4 | [MongoDB 9.0.4](https://patchblox.com/security/data/fix/windows-app/mongodb.server-9.0.4.md) | Oct 8, 2026 |

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Data as of 2026-11-10T07:50:38Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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