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As far as I’m aware, the MongoDB Java driver has not used log4j as a dependency.
The 3.4.3 Java driver (released in July 2017) has an optional logging dependency on SLF4J API 1.7.6:
If your application is using Java you should audit any potential usage of log4j, but this dependency should not be introduced by the MongoDB Java driver.
Regards,
Stennie