CVE-2026-8199: MongoDB

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

An authenticated user can cause excess memory usage via bitwise match expression AST processing of $bitsAllSet, $bitsAnySet, $bitsAllClear, and $bitsAnyClear. This contributes to memory pressure and may lead to availability loss by OOM. 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.

Affected products

• MongoDB MongoDB: from 7.0.0, before 7.0.34 (fixed in 7.0.34); from 8.0.0, before 8.0.23 (fixed in 8.0.23); from 8.2.0, before 8.2.9 (fixed in 8.2.9); from 8.3.0, before 8.3.2 (fixed in 8.3.2)

Published 2026-05-13. Last modified 2026-06-17.