CVE-2026-9750

Metadata name collision on $-prefixed fields causes post-auth server crash

State: Published
Severity: 7.1 High
Published: Jun 9, 2026
Updated: Jun 10, 2026
Reserved: May 27, 2026

Description

An authenticated user can cause a MongoDB server to crash or return incorrect results by creating documents that interfere with internal metadata processing during query execution. This stems from insufficient separation between user-controlled document fields and internal metadata in certain execution paths.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	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	mongodb
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	mongodb

Weaknesses

CWE-617 Reachable assertion

Affected Products

Product	Versions
MongoDB ServerMongoDB	8.3.0 to before 8.3.3Affected 8.2.0 to before 8.2.10Affected 8.0.0 to before 8.0.24Affected 7.0.0 to before 7.0.35Affected

References

https://jira.mongodb.org/browse/SERVER-123633

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