Medium severity · published Aug 11, 2026
CVE-2026-18707
Improper Input Validation in MongoDB Aggregation Command Handling Leads to Denial of Service
4.3
CVSS
0.4%
EPSS
No
On KEV
Description
An issue in MongoDB Server could allow an authenticated user, including one with no assigned privileges, to cause the server process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% 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 8.3.8 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18707
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18707
Vendor Advisory
https://jira.mongodb.org/browse/SERVER-128482
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