Java Edition 1.18.1 Release Candidate 3

1.18.1 Release Candidate 3 (known as 1.18.1-rc3 in the launcher) is the third and final release candidate for Java Edition 1.18.1, released on December 10, 2021, which fixes a critical security issue.

The security issue is that versions of the Log4j Java library allow attackers to run arbitrary code on client machines.

Fixes

 * Other
 * Fixed a critical security issue in which attackers are able to execute code on others' devices (RCE exploit) via in-game messaging or other methods where the game logs a certain exploitable string formatted as, due to an upstream vulnerability in log4j2.

Video
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