Java Edition 1.17 Release Candidate 2

Minecraft Wiki article. Categories: Java_Edition_development_versions_with_vulnerabilities, Java_Edition_versions, Java_Edition_1.17_release_candidates, Java_Edition_release_candidates_released_in_2021, Java_Edition_release_candidates, Pages_with_YouTube_videos

📌 Mirrored from Minecraft Wiki

This article is reproduced from Java Edition 1.17 Release Candidate 2 on the Minecraft Wiki. Mirrored from revision 3493546. It is licensed CC BY-NC-SA 3.0 by the Minecraft Wiki contributors — not under the Codex’s CC BY-SA 4.0, and it may not be used commercially. Edits belong upstream, not here.

This page covers a development version that has a major issue under certain conditions.

The dedicated server for this version has a security vulnerability in the Log4j library that could be used to perform a remote code execution exploit. It can be addressed by appending a certain JVM argument to the server startup command line.^[1]

Minecraft 1.17 Release Candidate 2

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1.17 Release Candidate 2 (known as 1.17-rc2 in the launcher) is the second and final release candidate for Java Edition 1.17, released on June 7, 2021,^[2] which fixes bugs and crashes.

Changes

Authlib was updated from 2.2.30 to 2.3.31.
Legacy skin handling now has improved skin validation.
The spawn egg dispenser behavior now catches any exceptions that could be thrown when spawning the entity.

Fixes

2 issues fixed

Other

2 private issues were fixed.^[3]

Videos

Video made by slicedlime:

Notes

↑ Re-enables features set to release for 1.18.

References

↑ "Important Message: Security vulnerability in Java Edition" – Minecraft.net, December 10, 2021.
↑ "Minecraft 1.17 Release Candidate 2" – Minecraft.net, June 7, 2021.
↑ https://www.reddit.com/r/Minecraft/comments/nub794/a_new_challenger_arrives_minecraft_117_release/h0wlnsc