CVE-2026-13055

Server crash via aggregation pipeline expression with compound wildcard index specification

State: Published
Severity: 7.1 High
Published: Jul 22, 2026
Updated: Jul 23, 2026
Reserved: Jun 23, 2026

Description

The `$_internalIndexKey` aggregation expression can be used by any authenticated user to crash a MongoDB server (mongod). The expression fails to handle compound wildcard index specifications, triggering an internal consistency check that aborts the server process. The user must be able to run an aggregation pipeline.

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/AU:Y/R:A	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	7.0 to before 7.0.39Affected 8.0 to before 8.0.28Affected 8.2.0 to before 8.2.12Affected 8.3.0 to before 8.3.7Affected

References

https://jira.mongodb.org/browse/SERVER-123081

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