Vulnerability · Published May 13, 2026 · Assigned by mongodb

CVE-2026-8199Post-auth memory exhaustion via bitwise match expressions

Medium 6.5

In plain English

A medium-severity security flaw in MongoDB Server from MongoDB, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 82.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
MongoDB, Inc.	MongoDB Server	7.0 – before 7.0.348.0 – before 8.0.238.2 – before 8.2.98.3 – before 8.3.2

Weakness: CWE-1325 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

https://jira.mongodb.org/browse/SERVER-122449 issue-tracking