# CVE-2026-106432: php-mongodb: The BSON encoder in the MongoDB PHP Driver converts a string length to a 32-bit value without validation

CVE-2026-106432 is fixed in php-mongodb on 1 platform, first by DEBIAN-CVE-2026-106432, released October 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-106432
- Priority: High
- CVSS: 8.2 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 8, 2026

## Description

The BSON encoder in the MongoDB PHP Driver converts a string length to a 32-bit value without validation. When an affected application encodes a string near 4 GiB, the allocation size can wrap while the copy operation uses the original length. The resulting heap buffer overflow can corrupt process memory or terminate the PHP process. Reaching this issue requires a non-default runtime configuration that permits multi-gigabyte values. No MongoDB server interaction is required.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | php-mongodb Debian 13.5 (trixie) | 2.0.0-1+deb13u2 | [DEBIAN-CVE-2026-106432](https://patchblox.com/security/data/fix/linux/debian-cve-2026-106432.md) | Oct 28, 2026 |
| Linux | php-mongodb Debian 14 | 2.5.5-1 | [DEBIAN-CVE-2026-106432](https://patchblox.com/security/data/fix/linux/debian-cve-2026-106432.md) | Oct 28, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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