Is CVE-2026-106433 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-106433?

CVE-2026-106433 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-106433

Description

Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.