CVE-2026-81523: MongoDB Libmongocrypt

Medium severity, CVSS 4.4. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• MongoDB Libmongocrypt: before 1.20.3 (fixed in 1.20.3)

Published 2026-08-27. Last modified 2026-09-17.