What is CVE-2026-9740?

CVE-2026-9740 is a high-severity vulnerability in Mongodb, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-06-09.

How severe is CVE-2026-9740?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Mongodb

CVE-2026-9740

A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits unc…

EPSS: 0.003 (27.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mongodb
Mongodb Server — versions 8.3.0, 8.2.0, 8.0.0

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

cna@mongodb.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-9740?: CVE-2026-9740 is a high-severity vulnerability in Mongodb, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-06-09.
How severe is CVE-2026-9740?: High severity. CVSS v3 base score is 7.5 out of 10.