# CVE-2026-106428: mongo-c-driver: An out-of-bounds read in SCRAM authentication response parsing in the MongoDB C Driver can read one byte beyond a fix...

CVE-2026-106428 is fixed in mongo-c-driver on 1 platform by DEBIAN-CVE-2026-106428 (version 2.4.0-1), released October 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-106428
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 8, 2026

## Description

An out-of-bounds read in SCRAM authentication response parsing in the MongoDB C Driver can read one byte beyond a fixed-size buffer when processing a malformed server-final message. A server or network intermediary able to provide this message before server-signature verification can cause the application using the driver to terminate. The extra byte is not returned through the protocol.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mongo-c-driver Debian 14 | 2.4.0-1 | [DEBIAN-CVE-2026-106428](https://patchblox.com/security/data/fix/linux/debian-cve-2026-106428.md) | Oct 9, 2026 |

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Data as of 2026-11-09T19:38:12Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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