Is CVE-2026-13055 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-13055?

CVE-2026-13055 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-13055

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.