# CVE-2026-81523: libmongocrypt: A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-suppli...

CVE-2026-81523 is fixed in libmongocrypt on 1 platform, first by DEBIAN-CVE-2026-81523, released September 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-81523
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0010
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 27, 2026

## Description

A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmongocrypt Debian 13.5 (trixie) | 1.13.2-1+deb13u1 | [DEBIAN-CVE-2026-81523](https://patchblox.com/security/data/fix/linux/debian-cve-2026-81523.md) | Sep 3, 2026 |
| Linux | libmongocrypt Debian 14 | 1.20.3-1 | [DEBIAN-CVE-2026-81523](https://patchblox.com/security/data/fix/linux/debian-cve-2026-81523.md) | Sep 3, 2026 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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