CVE-2026-8336
High
Description
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.
SeverityHigh
CVSS7.7
Exploit probability17. percentile0.3%
Product
Mongodb
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- mongodb mongodb8.2.9, 8.3.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mongodb mongodb | 8.2.0 ≤ v < 8.2.9, 8.3.0 ≤ v < 8.3.2 | 8.2.9, 8.3.2 |
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