CVE-2026-9741: MongoDB

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

A bug in query analysis processing of the $vectorSearch aggregation stage for Queryable Encryption (QE) or Client-Side Field Level Encryption (CSFLE) results in literal values for encrypted fields within the $vectorSearch stage filter expressions to be sent to the server as plaintext instead of ciphertext.

Affected products

• MongoDB MongoDB: from 7.0.0, before 7.0.35 (fixed in 7.0.35); from 8.0.0, before 8.0.24 (fixed in 8.0.24); from 8.2.0, before 8.2.10 (fixed in 8.2.10); from 8.3.0, before 8.3.3 (fixed in 8.3.3)

Published 2026-06-09. Last modified 2026-07-23.