CVE-2026-9740 HIGH

CVE-2026-9740: Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow

Vendor Mongodb
Product MongoDB Server
Weakness CWE-674
Published June 9, 2026
Last update June 10, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 10, 2026 Record updated