CVE-2026-8336 – Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands

CVE ID :CVE-2026-8336

Published : May 13, 2026, 12:16 a.m. | 41 minutes ago

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 v7.0 versions prior to 7.0.34, v8.0 versions prior to 8.0.23, v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.

Severity: 7.7 | HIGH

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