Healer Mod is a Minecraft mod designed to address the Log4Shell vulnerability (CVE-2021-44228) in Minecraft Forge versions 1.7.10 to 1.12.2. This vulnerability, discovered in December 2021, affects the Log4j logging library used by many Java applications, including Minecraft.
Features:
- Removes the JNDI lookup from the Interpolator using reflection and replaces the default LoggerContextFactory to catch any LoggerContext loaded after this mod.
- If your launcher or Mojang’s fix has already addressed this vulnerability, installing Healer may not be necessary.
- Including Healer in server packs is recommended to ensure protection against the Log4Shell vulnerability.
- If any mod tries to programatically tweak logging configuration, they will fail miserably due to the exhaustive patching. To fix this, healer postpones the patching late enough, until said mods are done with their editing.
Healer Mod Download Links
For All Versions from Minecraft 1.7.10 to Minecraft 1.12.2
Forge version: Download from Server 1 – Download from Server 2
Quick facts
- Edition: Minecraft Java
- File type: .jar
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: In MC Java Mods, or directly above on this page.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Downloads as 197274.mcaddon
- Download size: 17 KB
- Download link checked 26 Jul 2026 — working
- Mirrored on our own servers — the download does not depend on the original host
These come from our own check of the pack file, not from the source page.