What is CVE-2026-103965?

CVE-2026-103965 is a medium-severity vulnerability in MongoDB Server, classified under Code Injection. CVSS score: 5.4/10. Published 2026-10-13.

How severe is CVE-2026-103965?

Medium severity. CVSS v3 base score is 5.4 out of 10.

RCE in MongoDB Server

CVE-2026-103965

An issue in MongoDB Server's aggregation framework can cause certain constant values to be handled incorrectly during internal query rewriting. Under certain conditions, an authenticated user with read access may receive field values in aggregation output that the query did not intend to return.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

MongoDB Server

Weakness classification (CWE)

CWE-94 — Code Injection

References

jira.mongodb.org/browse/SERVER-134618

Frequently asked questions

What is CVE-2026-103965?: CVE-2026-103965 is a medium-severity vulnerability in MongoDB Server, classified under Code Injection. CVSS score: 5.4/10. Published 2026-10-13.
How severe is CVE-2026-103965?: Medium severity. CVSS v3 base score is 5.4 out of 10.