Application-Layer DDoS Attacks in 2026

The report describes a surge in application-layer (L7) DDoS attacks—especially API-targeted campaigns—and explains why they often bypass CDNs and WAFs due to misconfiguration, origin exposure, residential proxies, and precision botnets. It catalogs common L7 vectors (HTTP/S floods, Slowloris, large downloads, DNS query floods), highlights failure modes discovered during Red Button simulations (mis-tuned rate limits, WAF blind spots, host-based WAF exhaustion, mitigation latency), and recommends validated resilience testing, tuned rate limits, separation of WAF from origin, API coverage, and CDN caching for static assets to reduce outage risk and cost impact.