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

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://jira.mongodb.org/browse/SERVER-125063	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mongodb:mongodb::::::::
	cpe:2.3:a:mongodb:mongodb::::::::
	cpe:2.3:a:mongodb:mongodb::::::::
	cpe:2.3:a:mongodb:mongodb::::::::

History

23 Jul 2026, 09:10

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad en la lógica de validación BSON del servidor MongoDB permite a un usuario no autenticado colapsar el proceso mongod enviando un mensaje especialmente diseñado. El manejo por parte del validador BSON de ciertas estructuras de datos binarias anidadas permite una recursión mutua incontrolada entre funciones de validación, donde cada reentrada reinicia el seguimiento de profundidad interno.

15 Jun 2026, 16:55

Type	Values Removed	Values Added
CPE		cpe:2.3:a:mongodb:mongodb::::::::
References	~~() https://jira.mongodb.org/browse/SERVER-125063 -~~	() https://jira.mongodb.org/browse/SERVER-125063 - Vendor Advisory
First Time		Mongodb mongodb Mongodb

09 Jun 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-09 23:17

Updated : 2026-07-23 09:10

NVD link : CVE-2026-9740

Mitre link : CVE-2026-9740

CVE.ORG link : CVE-2026-9740

JSON object : View

Products Affected

mongodb

mongodb

CWE

CWE-674

Uncontrolled Recursion

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