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 Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, DDOS)

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