VDB
CVE-2026-9740
CVE-2026-9740
PUBLISHED
CVSS 8.7 HIGH
Reported by mongodb · Published June 9, 2026
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.
Risk Scores
CVSS 4.0
8.7
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
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | MongoDB Server | 8.3.0, 8.2.0, 8.0.0 |
| MongoDB | MongoDB Server | 8.3.0, 8.2.0, 8.0.0 |
Timeline
- Jun 9, 2026 CVE Published
- Jun 10, 2026 Coalition ESS Score
- Jun 10, 2026 CVE Updated
- Jun 12, 2026 Security Advisory