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Unsafe World Random Access DetectorMinecraft mod for 26.3

This is a mod that detects unsafe off-thread world random access, helping to find causes of "Accessing LegacyRandomSource from multiple threads" crash.

newest supported release 26.3Utility
Latest version
1.1.4+neoforge
Minecraft
1.19 to 26.3
Java
Java 25+
Loaders
NeoForge, Forge, Fabric
Licence
MIT
Downloads
1.7M
Updated
1 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Unsafe World Random Access Detector servers

One click and Unsafe World Random Access Detector is installed with the right loader, on hardware built for it.

  • 26.3
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Unsafe World Random Access Detector declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
26.3NeoForge, Forge, Fabric25+declared15 Sept 2026
26.2Fabric, NeoForge, Forge25+declared16 Jun 2026
26.1.2Forge, NeoForge, Fabric25+declared9 Apr 2026
26.1.1Forge, NeoForge, Fabric25+declared1 Apr 2026
26.1Forge, NeoForge, Fabric25+declared24 Mar 2026
26.1-rc-3Forge, NeoForge, Fabric25+declared23 Mar 2026
1.21.11Fabric, NeoForge, Forge21+declared9 Dec 2025
1.21.10NeoForge, Forge, Fabric21+declared7 Oct 2025
1.21.9Fabric, NeoForge, Forge21+declared30 Sept 2025
1.21.8Forge, NeoForge, Fabric21+declared17 Jul 2025
1.21.7Forge, NeoForge, Fabric21+declared30 Jun 2025
1.21.6Forge, NeoForge, Fabric21+declared17 Jun 2025
1.21.5Forge, NeoForge, Fabric21+declared25 Mar 2025
1.21.4Forge, NeoForge, Fabric21+declared3 Dec 2024
1.21.3Fabric, Forge, NeoForge21+declared23 Oct 2024
1.21.2NeoForge, Forge, Fabric21+declared22 Oct 2024
1.21.1Fabric, NeoForge, Forge21+declared8 Aug 2024
1.21Forge, NeoForge, Fabric21+declared13 Jun 2024
1.20.6Forge, NeoForge, Fabric21+declared29 Apr 2024
1.20.5Forge, NeoForge, Fabric21+declared23 Apr 2024
1.20.4Forge, NeoForge, Fabric17+declared7 Dec 2023
1.20.3Forge, NeoForge, Fabric17+declared4 Dec 2023
1.20.2NeoForge, Forge, Fabric17+declared20 Sept 2023
1.20.1NeoForge, Forge, Fabric17+declared12 Jun 2023
1.20Fabric, NeoForge, Forge17+declared2 Jun 2023
1.19.4Forge, NeoForge, Fabric17+declared14 Mar 2023
1.19.3Forge, NeoForge, Fabric17+declared7 Dec 2022
1.19.2Forge, NeoForge, Fabric17+declared5 Aug 2022
1.19.1Forge, NeoForge, Fabric17+declared27 Jul 2022
1.19Forge, Fabric, NeoForge17+declared7 Jun 2022

Download

From Unsafe World Random Access Detector’s own host. Nothing is re-hosted here.

Most recently published release

1.1.4+neoforgerelease5 Oct 2026

unsafe-world-random-access-detector-1.1.4+neoforge.jar · 21 KB · for 26.3, 26.2, 26.1.2, 26.1.1, 26.1 +12 more · NeoForge

Download this release
8ed9f91c04e0…
Older versions8
  • 1.1.45 Oct 20261.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7 +19 more20 KBb2498d14bbb0…Get
  • 1.2.024 Mar 202626.2, 26.1.2, 26.1.1, 26.1, 26.1-rc-320 KB864a5f4ee7c9…Get
  • 1.1.3+neoforge26 May 20251.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1 +1 more22 KBb1e516eedffc…Get
  • 1.1.1+neoforge29 Sept 20241.21.1, 1.2121 KBfb505392cdf1…Get
  • 1.1.1+forge29 Sept 20241.21.1, 1.21, 1.20.621 KB9350e01b9880…Get
  • 1.1.0+forge22 Apr 20231.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20 +5 more22 KB9eb369537215…Get
  • 1.1.025 Feb 20231.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7 +19 more20 KB135a2975a8a0…Get
  • 1.0.04 Feb 20231.19.3, 1.19.2, 1.19.1, 1.197 KBd7607355ab28…Get

Frequently asked

Does Unsafe World Random Access Detector work on Minecraft 26.3?

Yes. 26.3 is the newest Minecraft version Unsafe World Random Access Detector declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Unsafe World Random Access Detector support?

Everything the author has declared, from 1.19 up to 26.3. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Unsafe World Random Access Detector support?

NeoForge, Forge, Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Unsafe World Random Access Detector?

Among the supported Minecraft releases above, the highest recorded requirement is Java 25 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is Unsafe World Random Access Detector under?

MIT, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Unsafe World Random Access Detector?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Unsafe World Random Access Detector safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 5 Oct 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .