Vulnerability Details CVE-2026-8336
After invoking $_internalJsEmit, which is not intended to be directly accessible, or mapreduce command’s map function in a certain way, an authenticated user can subsequently crash mongod when the server-side JavaScript engine (through $where, $function, mapreduce reduce stage, etc.) is used also in a specific way, resulting in a post-authentication denial-of-service.
This issue impacts MongoDB Server v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 20.2%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-8336
-
cpe:2.3:a:mongodb:mongodb:8.2.0
-
cpe:2.3:a:mongodb:mongodb:8.2.1
-
cpe:2.3:a:mongodb:mongodb:8.2.2
-
cpe:2.3:a:mongodb:mongodb:8.2.3
-
cpe:2.3:a:mongodb:mongodb:8.2.4
-
cpe:2.3:a:mongodb:mongodb:8.2.5
-
cpe:2.3:a:mongodb:mongodb:8.2.6
-
cpe:2.3:a:mongodb:mongodb:8.2.7
-
cpe:2.3:a:mongodb:mongodb:8.3.0