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Log4JPatcher project artwork

CurseForge · Minecraft mod

Log4JPatcher

A java agent to patch the CVE in L4J2

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Log4JPatcher release matches 1.7.7 Fabric?

Updated 4 years ago
Best match for your filters Log4jPatcher-1.0.1.jar
Game version 1.7.6, 1.16-Snapshot, 1.17.1
Loader Fabric, Forge

Log4jPatcher-1.0.1.jar targets 1.7.6, 1.16-Snapshot, 1.17.1 with Fabric, Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Log4JPatcher required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Fabric, Forge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Log4jPatcher-1.0.1.jar need?

Log4jPatcher-1.0.1.jar on 1.7.7 Fabric. Every mod below is checked against that same setup.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Log4JPatcher without breaking your instance.

Built for Log4jPatcher-1.0.1.jar on 1.7.7 Fabric. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use Log4jPatcher-1.0.1.jar. It targets 1.7.6, 1.16-Snapshot, 1.17.1 with Fabric, Forge; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside Log4jPatcher-1.0.1.jar. It opens that exact file at the source.

About this project

What does Log4JPatcher add?

Log4jPatcher

A Java Agent based mitigation for Log4j2 JNDI exploits.

This agent employs 2 patches:

  • Disabling all Lookup conversions (on supported Log4j versions) in org.apache.logging.log4j.core.pattern.MessagePatternConverter by setting noLookups to true in the constructor.
  • Disabling the org.apache.logging.log4j.core.lookup.JndiLookup class by just returning null in its lookup function.

To use

Add -javaagent:Log4jPatcher.jar as a JVM argument.

More information on this CVE and it's impact is available at CreeperBlog (creeperhost.net)

Project description from CurseForge.

Pick your setup

Log4JPatcher by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

172 available setups

Showing the newest 12 of 86 game versions. Older files are in the list below.

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

Log4JPatcher versions and loaders

2 of 2 releases match
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Looking for an older file? The official CurseForge project page is in Resources.