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.
- Affected products
- Mongodb Server
- Mongodb
- < 7.0.35, 8.0.24, 8.2.10, 8.3.3
- CVSS 4.0
- 8.7 HIGH
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.3% (27th percentile)
- Weakness
- CWE-674
- NVD status
- Analyzed
- Published
- 2026-06-09
CVE-2026-9740 at NVD
No indexed exploits for CVE-2026-9740 yet
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No exploit for CVE-2026-9740 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.