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 crash mongod when the server-side JavaScript engine through $where, $function, mapreduce reduce stage, etc. is used also in...

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 crash mongod when the server-side JavaScript engine through $where, $function, mapreduce reduce stage, etc. is used also in...

CVE-2026-8336

CVE-2026-8336 describes a post-authentication use-after-free in MongoDB Server related to $_internalJsEmit and mapreduce map function usage. According to the provided documents, when an authenticated user invokes these elements (with server-side JavaScript engine features such as $where, $functio...