EUVD-2026-39055

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, when using Ruby versions older than 3.4, PrivateAddressCheck.privateaddress? returns false for IPv4-mapped IPv6 addresses ::ffff:a.b.c.d corresponding to some private IPv4 addresses,...

A Worldwide Hacking Spree Uses DNS Trickery to Nab Data

Security researchers suspect that Iran has spent the last two years pilfering data from telecoms, governments, and more...

The .io Error – Taking Control of All .io Domains With a Targeted Registration

In a previous post we talked about taking over the .na, .co.ao, and .it.ao domain extensions with varying levels of DNS trickery. In that writeup we examined the threat model of compromising a top level domain TLD and what some avenues would look like for an attacker to accomplish this goal. One ...

The International Incident – Gaining Control of a .int Domain Name With DNS Trickery

The .int or international TLD is perhaps one of the most exclusive extensions available on the Internet. The number of domains on the extension is so small it has it’s own Wikipedia page. Introduced around 27 years ago its primary purpose has been for international treaty organizations. The...