HTTP/2 Bomb Remote DoS Exploit Impacts nginx, Apache, IIS, Envoy, and Cloudflare Pingora

Gbhackers •Divya • June 3, 2026

A newly disclosed “HTTP/2 Bomb” attack is raising serious concerns across the web infrastructure ecosystem, enabling remote denial-of-service (DoS) conditions against widely deployed servers including nginx, Apache httpd, Microsoft IIS, Envoy, and Cloudflare Pingora. Overview of the HTTP/2 Bomb Attack Security researcher Quang Luong, working with the Codex team, uncovered a novel exploitation technique that […]

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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.

New HTTP/2 Bomb DoS Attack Crashes Major Web Servers The HTTP/2 Bomb is a newly discovered denial-of-service (DoS) attack that targets default configurations of major web servers, including NGINX, Apache, Microsoft IIS, Envoy, and Cloudflare Pingora. This attack, identified by researchers at Calif and OpenAI's Codex, exploits the HPACK header compression mechanism and employs a zero-byte flow-control window to prevent memory from being released. A single attacker can exhaust tens of gigabytes of server memory in seconds, rendering the server inaccessible. Proof-of-concept exploits have been published, and while some platforms have released patches, many remain vulnerable. The full technical details will be presented at the Real World AI Security conference later this month. 11 sources 69

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HTTP/2 Bomb Remote DoS Exploit Impacts nginx, Apache, IIS, Envoy, and Cloudflare Pingora

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Platforms (3)

Tools (1)