What is CVE-2026-120817?

CVE-2026-120817 is a medium-severity vulnerability in MongoDB Server, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.5/10. Published 2026-11-10.

How severe is CVE-2026-120817?

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

Vulnerability in MongoDB Server

CVE-2026-120817

A race condition in the schema validation component of MongoDB Server can occur when concurrent writes are checked against a collection validator that uses geospatial query operators. The condition can be caused by an authenticated user with write privileges, and may result in the server terminating unexpectedly.

Vulnerability class: Race Condition

Published 2026-11-10 · last modified 2026-11-10.

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:N/I:N/A:H.

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-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

jira.mongodb.org/browse/SERVER-135655

Frequently asked questions

What is CVE-2026-120817?: CVE-2026-120817 is a medium-severity vulnerability in MongoDB Server, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.5/10. Published 2026-11-10.
How severe is CVE-2026-120817?: Medium severity. CVSS v3 base score is 6.5 out of 10.