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Mastodon hit by DDoS attack, disrupting flagship server | brief

Scworld • April 21, 2026

As reported by TechCrunch, Mastodon's primary server, mastodon.social, experienced a significant distributed denial-of-service (DDoS) attack on Monday, rendering the instance intermittently unusable and causing widespread disruption for its users.

The cyberattack began early Monday morning, with Mastodon confirming the investigation around 7 a.m. ET. The attack flooded the server with junk web traffic, aiming to overwhelm its systems. By 9:05 a.m. ET, Mastodon announced a countermeasure had been implemented, restoring accessibility, though some instability persisted due to the ongoing nature of the attack.

This incident follows a similar DDoS attack that recently impacted Bluesky, another decentralized social network. Distributed denial-of-service attacks, while not involving data theft, can be highly disruptive by making services inaccessible.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Mastodon's flagship server suffers major DDoS attack, disrupting service Mastodon's flagship server, mastodon.social, experienced a severe DDoS attack on April 20, 2026, which temporarily rendered the site inaccessible to many users. The attack involved a flood of malicious web traffic that overwhelmed the server's infrastructure, leading to full-screen outage warnings for visitors. While the primary instance was affected, users on other Mastodon servers remained unaffected. Mastodon's head of communications confirmed that countermeasures were implemented, restoring access by 9:05 a.m. ET, although some instability persisted. This incident follows a similar DDoS attack on Bluesky, another decentralized social network, just days earlier, suggesting a potential pattern of targeting decentralized platforms. Security experts are monitoring the situation closely, as these attacks could indicate broader threats to the federated social media ecosystem. The attack highlights the vulnerabilities inherent in decentralized networks, particularly their reliance on key servers like mastodon.social. 6 sources 55

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Mastodon hit by DDoS attack, disrupting flagship server | brief

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