Medium severity · published Jun 9, 2026
CVE-2026-9750
Metadata name collision on $-prefixed fields causes post-auth server crash
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
An authenticated user can cause a MongoDB server to crash or return incorrect results by creating documents that interfere with internal metadata processing during query execution. This stems from insufficient separation between user-controlled document fields and internal metadata in certain execution paths.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.3.0 before 8.3.3; 8.2.0 before 8.2.10; 8.0.0 before 8.0.24; 7.0.0 before 7.0.35 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9750
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9750
Vendor Advisory
https://jira.mongodb.org/browse/SERVER-123633
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