# CVE-2025-14847: mongodb: Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unau...

CVE-2025-14847 is fixed in 4 products on 1 platform, first by mongodb 1:3.6.3-0ubuntu1.4+esm2, released December 19, 2025. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on December 29, 2025. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/cve/CVE-2025-14847
- Priority: Patch now
- CVSS: n/a (High)
- EPSS: 0.8322
- CISA KEV: listed Dec 29, 2025, federal due date Jan 19, 2026
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 19, 2025

## Description

Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unauthenticated client. This issue affects all MongoDB Server v7.0 prior to 7.0.28 versions, MongoDB Server v8.0 versions prior to 8.0.17, MongoDB Server v8.2 versions prior to 8.2.3, MongoDB Server v6.0 versions prior to 6.0.27, MongoDB Server v5.0 versions prior to 5.0.32, MongoDB Server v4.4 versions prior to 4.4.30, MongoDB Server v4.2 versions greater than or equal to 4.2.0, MongoDB Server v4.0 versions greater than or equal to 4.0.0, and MongoDB Server v3.6 versions greater than or equal to 3.6.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mongodb Ubuntu 18.04.6 LTS (bionic) | 1:3.6.3-0ubuntu1.4+esm2 | [mongodb 1:3.6.3-0ubuntu1.4+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mongodb-1-3.6.3-0ubuntu1.4-esm2.md) | Dec 19, 2025 |
| Linux | mongodb Ubuntu 20.04 LTS (focal) | 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1 | [mongodb 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mongodb-1-3.6.9-really3.6.8-90-g8e540c0b6d-0ubuntu5.3-esm1.md) | Dec 19, 2025 |
| Linux | mongodb-clients Ubuntu 18.04.6 LTS (bionic) | 1:3.6.3-0ubuntu1.4+esm2 | [mongodb-clients 1:3.6.3-0ubuntu1.4+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mongodb-clients-1-3.6.3-0ubuntu1.4-esm2.md) | Dec 19, 2025 |
| Linux | mongodb-clients Ubuntu 20.04 LTS (focal) | 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1 | [mongodb-clients 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mongodb-clients-1-3.6.9-really3.6.8-90-g8e540c0b6d-0ubuntu5.3-esm1.md) | Dec 19, 2025 |
| Linux | mongodb-server Ubuntu 18.04.6 LTS (bionic) | 1:3.6.3-0ubuntu1.4+esm2 | [mongodb-server 1:3.6.3-0ubuntu1.4+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mongodb-server-1-3.6.3-0ubuntu1.4-esm2.md) | Dec 19, 2025 |
| Linux | mongodb-server Ubuntu 20.04 LTS (focal) | 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1 | [mongodb-server 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mongodb-server-1-3.6.9-really3.6.8-90-g8e540c0b6d-0ubuntu5.3-esm1.md) | Dec 19, 2025 |
| Linux | mongodb-server-core Ubuntu 18.04.6 LTS (bionic) | 1:3.6.3-0ubuntu1.4+esm2 | [mongodb-server-core 1:3.6.3-0ubuntu1.4+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mongodb-server-core-1-3.6.3-0ubuntu1.4-esm2.md) | Dec 19, 2025 |
| Linux | mongodb-server-core Ubuntu 20.04 LTS (focal) | 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1 | [mongodb-server-core 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mongodb-server-core-1-3.6.9-really3.6.8-90-g8e540c0b6d-0ubuntu5.3-esm1.md) | Dec 19, 2025 |

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Data as of 2026-11-08T13:06:02Z 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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