High severity · published Feb 10, 2026
CVE-2026-1850
An authorized user may disable the MongoDB server by issuing a certain type of complex query due to boolean expression simplification
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
Complex queries can cause excessive memory usage in MongoDB Query Planner resulting in an Out-Of-Memory Crash.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.0.0 before 8.0.18; 8.2.0 before 8.2.4 · source: NVD
MS
MongoDB Server · MongoDB Inc
8.0 before 8.0.18; 8.2 before 8.2.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1850
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1850
Vendor Advisory
https://jira.mongodb.org/browse/SERVER-114126
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