Large-scale DDoS attacks disrupted Threema secure messaging service
Multiple distributed denial-of-service (DDoS) attacks targeted the Threema secure messaging service earlier this week, causing severe disruptions to communications. [...]
Source: BleepingComputer · August 16, 2026 at 7:03 PM · AI-assisted report
KUALA LUMPUR, 17 AUGUST 2026 —
Listen to this article
DomainFork Audio · read aloud
Large-scale DDoS attacks disrupt Threema secure messaging service in Europe
Market Impact
Multiple distributed denial-of-service (DDoS) attacks disrupted Threema, a secure messaging service based in Switzerland, earlier this week, causing severe communication outages. Users in Switzerland, India, and China reported service disruptions despite the company’s status page showing no issues. Threema confirmed the attacks targeted both its infrastructure and a colocation partner, Nine, though it remains unclear whether it was the primary target.
Malaysia market impact: Details not yet available
The incident did not immediately affect Malaysian users of Threema, as the service relies on its own server infrastructure in Switzerland. Organizations using Threema On-Prem, which operates on private infrastructure, were unaffected. Threema has since implemented additional DDoS protection measures to filter attack traffic and reduce load on its systems.
DDoS attacks overwhelmed Threema’s defenses
Threema, a paid end-to-end encrypted messaging app, experienced service interruptions starting Tuesday around 6 PM UTC. Initial reports attributed the issue to a network outage at a colocation partner, but subsequent investigations revealed large-scale DDoS attacks. The attacks persisted for hours, with the threat actor frequently changing tactics to bypass mitigation efforts. Threema’s status page was also taken offline due to an unrelated technical issue, delaying updates for users.
Outlook: Enhanced protections implemented
Threema has introduced specialized DDoS protection to prevent future disruptions and is working to restore full service stability. Business customers using Threema Work were notified via email about the unstable conditions. While the company did not specify the scale of the attacks, it acknowledged the challenges in defending against evolving DDoS tactics. Further updates on service restoration are expected as mitigation efforts continue.