Java Edition 1.21.1

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| title = Minecraft 1.21.1 | image = 1.21.1 banner.jpg | image2 = Java Edition 1.21.1.png | edition = Java | version = 1.21.1 | date = August 8, 2024 | jsonhash = 94f420093e771cd1e72614184736b044c747a8df | clienthash = 30c73b1c5da787909b2f73340419fdf13b9def88 | clientmap = 2244b6f072256667bcd9a73df124d6c58de77992 | serverhash = 59353fb40c36d304f2035d51e7d6e6baa98dc05c | servermap = 03f8985492bda0afc0898465341eb0acef35f570 | prevparent = 1.21 | prev = | next = | nextparent = }} 1.21.1 is a minor hotfix update to Java Edition released on August 8, 2024, which fixes critical exploits including update suppression, and adds two new languages. It is compatible with 1.21 servers.

Additions

General

New languages

• Added support for Tzotzil and Belarusian (Latin) languages.

Fixes

2 issues fixed

Private issues

• Fixed block entity swap based update suppression as shown in this video: [1].
• Fixed an exploit which allows modified clients to crash the server by requesting command completion for a malicious target selector input, causing a crash due to stack exhaustion.

Video

Video made by Slicedlime:

Trivia

• 1.21.1 is the fourth minor update since 1.20 released to fix critical bugs in the prior release version, after 1.20.1, 1.20.4, and 1.20.6.
  • It is also the sixth Java Edition update whose development versions consist only of a single release candidate, after 1.16.3, 1.16.5, and the aforementioned minor versions of 1.20.