CVE-2026-11933: MongoDB

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example, via $where or $function) can cause the server to access memory that has already been freed. This may result in disclosure of information from the mongod process memory or a denial of service through a server crash.

Affected products

• MongoDB MongoDB: from 4.4.0, before 4.4.31 (fixed in 4.4.31); from 5.0.0, before 5.0.34 (fixed in 5.0.34); from 6.0.0, before 6.0.29 (fixed in 6.0.29); from 7.0.0, before 7.0.37 (fixed in 7.0.37); from 8.0.0, before 8.0.26 (fixed in 8.0.26); from 8.2.0, before 8.2.11 (fixed in 8.2.11); …

Published 2026-06-12. Last modified 2026-06-22.