Can server anticheats block Hitbox Mixin Return Value Override?

Server-side anticheats monitor movement and packet anomalies, while static analysis with Leaf Mod Analyzer identifies hostile and unfair code before mods are loaded.

Hitbox Mixin Return Value Override

Q: How does Leaf Mod Analyzer detect Hitbox_Mixin_Override?

Leaf Mod Analyzer performs static analysis of JVM bytecode and decompiled AST structures matching Detects Mixin injection annotations targeting getBoundingBox (method_5829), getTargetingMargin (method_5871), or getDimensions (method_18376). in an isolated environment without executing untrusted JAR files.

🎮 Minecraft Gameplay Impact

Hooks Entity.getBoundingBox() or Entity.getTargetingMargin() via Mixin annotations (@ModifyReturnValue, @Inject) to return an inflated bounding box, making players clickable and attackable far beyond their visible character model.

🔍 Functions & APIs Analyzed

Entity.getBoundingBox

Core bounding box getter (method_5829) used in raycasting and collision.

Entity.getTargetingMargin

Collision margin getter (method_5871) added to hitboxes during raycast picking.

ModifyReturnValue / ModifyExpressionValue

Mixin annotations altering method return values.

💻 Mod Implementation (Dev Source / Mapped)

// Developer Source (Fabric / Yarn mappings)
@Mixin(Entity.class)
public class HitboxMixin {
    @ModifyReturnValue(method = "getTargetingMargin", at = @At("RETURN"))
    private float expandMargin(float original) {
        return original + 0.4f;
    }
}

⚙️ Decompiled Representation (Vineflower View)

// Decompiled with Vineflower 1.12 (Intermediary mappings)
@Mixin({class_1297.class})
public class HitboxMixin {
    @ModifyReturnValue(method = {"method_5871"}, at = @At("RETURN"))
    private float expandMargin(float original) {
        return original + 0.4F;
    }
}

🛡️ Bytecode Signature & Static Detection

Detects Mixin injection annotations targeting getBoundingBox (method_5829), getTargetingMargin (method_5871), or getDimensions (method_18376).