MongoDB Server <7.0.34/8.0.23/8.2.9/8.3.2: Auth DoS via _internalJsEmit
CVE-2026-8336 Published on May 13, 2026
Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands
After invoking $_internalJsEmit, which is not intended to be directly accessible, or mapreduce commands 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.
Vulnerability Analysis
CVE-2026-8336 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-8336 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-8336
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Affected Versions
MongoDB, Inc. MongoDB Server:- Version 8.2 and below 8.2.9 is affected.
- Version 8.3 and below 8.3.2 is affected.