Mastodon suffered a major DDoS attack shortly after a similar incident hit Bluesky. The outage was significant but resolved within a few hours.Mastodon was hit by a major DDoS attack just days after a similar disruption affected Bluesky. Mastodon is a free and open-source software platform for decentralized social networking with microblogging features similar to X.The attack caused a major outage, impacting users across the decentralized platform. However, Mastodon’s team responded quickly and mitigated the issue within a few hours, restoring normal service.Below is the timeline of the attack:April 20, 2026 at 12:58 PM – We are currently experiencing a DDoS attack. We are actively investigating the issue.April 20, 2026 at 3:05 PM – We have implemented countermeasure against the DDoS attack, and the site is accessible. We are continuing to monitor the situation.April 20, 2026 at 12:58 PM – We are currently experiencing a DDoS attack. We are actively investigating the issue.A group called 313 Team claimed responsibility for the attack on Bluesky, but no threat actor has publicly taken credit for the Mastodon attack.Follow me on Twitter: @securityaffairs and Facebook and MastodonPierluigi Paganini(SecurityAffairs – hacking, DDOS)