# CVE-2026-106433: libmongocrypt: Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible...

CVE-2026-106433 is fixed in libmongocrypt on 1 platform by DEBIAN-CVE-2026-106433 (version 1.20.5-1), released October 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-106433
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 8, 2026

## Description

Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmongocrypt Debian 14 | 1.20.5-1 | [DEBIAN-CVE-2026-106433](https://patchblox.com/security/data/fix/linux/debian-cve-2026-106433.md) | Oct 16, 2026 |

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Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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