Is CVE-2026-120678 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-120678?

CVE-2026-120678 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-120678

Description

A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.