Is CVE-2026-18688 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18688?

CVE-2026-18688 has a CVSS v3 severity of HIGH (7.1).

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CVE-2026-18688

Description

An issue in MongoDB Server's aggregation framework could allow an authenticated user to trigger an out-of-bounds memory read by providing a specially formed numeric parameter in a certain aggregation pipeline stage. This could result in a server crash (denial of service) and may potentially expose a limited amount of memory contents.