What is CVE-2026-9741?

CVE-2026-9741 is a medium-severity vulnerability in MongoDB, classified under Cleartext Transmission of Sensitive Information. CVSS score: 6.5/10. Published 2026-06-09.

How severe is CVE-2026-9741?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in MongoDB

CVE-2026-9741

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.

Published 2026-06-09 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001

Affected products

MongoDB
MongoDB Server — versions 8.3.0, 8.2.0, 8.0.0

Weakness classification (CWE)

CWE-319 — Cleartext Transmission of Sensitive Information

References

jira.mongodb.org/browse/SERVER-123507 (Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9741?: CVE-2026-9741 is a medium-severity vulnerability in MongoDB, classified under Cleartext Transmission of Sensitive Information. CVSS score: 6.5/10. Published 2026-06-09.
How severe is CVE-2026-9741?: Medium severity. CVSS v3 base score is 6.5 out of 10.