Any IPv6 Scanning Fails with 'No valid ipv4 or ipv6 targets were found' error

[nightshiba]

Naabu version:

2.3.1 (latest)

Current Behavior:

I am encountering an issue where the command "naabu -r '2001:4860:4860::8888' -p 80,443 -host '2001:4860:4860::8888' -json -debug" fails to execute properly. This behavior is consistent across different IPv6 addresses and domain names. Below are screenshots showing the error on two different machines:

1st machine (VPS):

2nd machine (laptop):

Expected Behavior:

The command should successfully run without errors, scanning the specified IPv6 addresses and domain names.

Steps To Reproduce:

1. Execute the command naabu -r '2001:4860:4860::8888' -p 80,443 -host '2001:4860:4860::8888' -json -debug on a system with naabu version 2.3.1.
2. Observe the failure to process the command as shown in the provided screenshots (443 port is not detected).

[nightshiba]

Seems to be related to the following issue - #1113 (comment)

[nightshiba]

You can reproduce it on Scaleway's instance (DEV1-S, Debian 12) by running:

wget https://go.dev/dl/go1.23.2.linux-amd64.tar.gz
tar -C /usr/local -xzf go1.23.2.linux-amd64.tar.gz
apt update
apt install -y libpcap-dev build-essential
CGO_ENABLED=1 go install -v github.com/projectdiscovery/naabu/v2/cmd/naabu@latest
./go/bin/naabu -p 80,443,22 -host '2001:4860:4860::8888' -json -debug

CC @dogancanbakir @Mzack9999

[nightshiba]

I found that the command works when I specify the IP version with -iv 6 🤦. I thought I had tried this before, but it turns out it’s necessary:

naabu -p 80,443,22 -host 'ipv6.google.com' -debug -iv 6

It’s surprising that Naabu doesn’t detect the IP version automatically from the target..