What you need to do
Official game client
If you play Minecraft: Java Edition, but aren’t hosting your own server, you will need to take the following steps: Close all running instances of the game and the Minecraft Launcher. Start the Launcher again – the patched version will download automatically.
Modified clients and third-party launchers
Modified clients and third-party launchers might not be automatically updated. In these cases, we recommend following the advice of your third-party provider. If the third-party provider has not patched the vulnerability, or has not stated it is safe to play, you should assume the vulnerability is not fixed and you are at risk by playing.
Game Server
If you’re hosting your own Minecraft: Java Edition server, you'll need to take different steps depending on which version you’re using, in order to secure it.
1.18: Upgrade to 1.18.1, if possible. If not, use the same approach as for 1.17.x:
1.17: Add the following JVM arguments to your startup command line:
-Dlog4j2.formatMsgNoLookups=true
1.12-1.16.5: Download this file to the working directory where your server runs. Then add the following JVM arguments to your startup command line:
-Dlog4j.configurationFile=log4j2_112-116.xml
1.7-1.11.2: Download this file to the working directory where your server runs. Then add the following JVM arguments to your startup command line:
-Dlog4j.configurationFile=log4j2_17-111.xml
Versions below 1.7 are not affected
We’ll post any additional information on our social media channels, so keep an eye out! Thank you!
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