CVE-2026-9740
Last modified
CVE-2026-9740 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mongodb | Mongodb | >= 7.0.0, < 7.0.35 |
| Mongodb | Mongodb | >= 8.0.0, < 8.0.24 |
| Mongodb | Mongodb | >= 8.2.0, < 8.2.10 |
| Mongodb | Mongodb | >= 8.3.0, < 8.3.3 |
References
- https://jira.mongodb.org/browse/SERVER-125063Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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