CVE-2026-8336 — Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands
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 cr…
Published: 2026-05-13 · CVSS: 7.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7