CVE-2026-8199 PUBLISHED

Post-auth memory exhaustion via bitwise match expressions

Assigner: mongodb
Reserved: 08.05.2026 Published: 13.05.2026 Updated: 13.05.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	MongoDB, Inc.
Product	MongoDB Server
Versions	Default: unaffected affected from 7.0 to 7.0.34 (excl.) affected from 8.0 to 8.0.23 (excl.) affected from 8.2 to 8.2.9 (excl.) affected from 8.3 to 8.3.2 (excl.)

References

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

Problem Types

CWE-1325: Improperly Controlled Sequential Memory Allocation CWE