CVE-2026-9740

8.7 highEPSS 0.3%

High (8.7) in mongodb mongodb. EPSS 0.3% chance of exploitation in the next 30 days.

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 uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.

Severity

CVSS 4.0

8.7 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-31)
CWE: CWE-674
Published: 2026-06-09
Modified: 2026-07-23
Record from: the NVD, synced 2026-10-19

Affected

mongodb:mongodb

References

https://jira.mongodb.org/browse/SERVER-125063

Check your stack JSON