{"id":181899,"date":"2026-06-04T14:48:20","date_gmt":"2026-06-04T12:48:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati"},"modified":"2026-06-04T14:48:20","modified_gmt":"2026-06-04T12:48:20","slug":"ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati","title":{"rendered":"Um ataque a implementa\u00e7\u00f5es HTTP\/2, que leva ao esgotamento da mem\u00f3ria dispon\u00edvel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Foi revelada uma vulnerabilidade chamada 'HTTP\/2 Bomb', que afeta v\u00e1rias implementa\u00e7\u00f5es do protocolo HTTP\/2 e permite causar indisponibilidade atrav\u00e9s da exaust\u00e3o de toda a mem\u00f3ria dispon\u00edvel do processo. A exist\u00eancia do problema foi confirmada em servidores HTTP nginx, Apache httpd (CVE-2026-49975), Microsoft IIS, Envoy (CVE-2026-47774) e Cloudflare Pingora na configura\u00e7\u00e3o padr\u00e3o.<\/p>\n

A vulnerabilidade utiliza um m\u00e9todo semelhante a uma bomba zip, aplicada \u00e0 funcionalidade de compress\u00e3o de cabe\u00e7alhos no HTTP\/2. A ideia \u00e9 que a solicita\u00e7\u00e3o pode conter milhares de cabe\u00e7alhos comprimidos, como 'Cookie', sem dados anexados, cada um dos quais na solicita\u00e7\u00e3o \u00e9 representado por uma refer\u00eancia de um byte no \u00edndice HPACK, mas em servidor<\/a> exige aloca\u00e7\u00e3o de mem\u00f3ria completa para todo o cabe\u00e7alho. O n\u00edvel de consumo de mem\u00f3ria em diferentes servidores HTTP varia de aproximadamente 70 bytes por cada byte no \u00edndice para nginx, IIS e Pingora, at\u00e9 4000 bytes no Apache httpd e 5700 no Envoy. Em um ataque originado de um computador pessoal com uma conex\u00e3o de 100Mbps, para esgotar 32 GB de mem\u00f3ria s\u00e3o necess\u00e1rios cerca de 10 segundos para atacar servidor<\/a> Envoy 1.37.2, 18 segundos \u2014 Apache httpd 2.4.67 e 45 segundos \u2014 nginx 1.29.7.<\/p>\n

Para bloquear a vulnerabilidade, na vers\u00e3o nginx 1.29.8, a diretiva max_headers foi transferida do projeto freenginx, que por padr\u00e3o permite o processamento de n\u00e3o mais do que 1000 cabe\u00e7alhos. No Envoy, a corre\u00e7\u00e3o
\nest\u00e1 inclu\u00edda nas vers\u00f5es 1.35.11 e 1.36.7, nas quais limites mutable_max_request_headers_kb e max_headers_count foram implementados. No Apache httpd, a corre\u00e7\u00e3o foi proposta na vers\u00e3o do m\u00f3dulo mod_http2 2.0.41, que ainda n\u00e3o foi inclu\u00edda nas releases do Apache httpd. Para
\nMicrosoft IIS e Cloudflare Pingora, corre\u00e7\u00f5es ainda n\u00e3o est\u00e3o dispon\u00edveis.
\nComo uma solu\u00e7\u00e3o alternativa de prote\u00e7\u00e3o, \u00e9 poss\u00edvel desabilitar o uso do protocolo HTTP\/2 e impor um limite no tamanho da mem\u00f3ria dispon\u00edvel para os processos de trabalho.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181899","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Ataque a implementa\u00e7\u00f5es HTTP\/2, resultando no esgotamento da mem\u00f3ria dispon\u00edvel | ProHoster","description":"Foi revelada uma vulnerabilidade chamada \"HTTP\/2 Bomb\", que afeta diversas implementa\u00e7\u00f5es do protocolo HTTP\/2 e permite causar uma nega\u00e7\u00e3o de servi\u00e7o ao esgotar toda a mem\u00f3ria dispon\u00edvel do processo.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0410\u0442\u0430\u043a\u0430 \u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 HTTP\/2, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044e \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 "HTTP\/2 Bomb", \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0435\u0439 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/2 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u0435 \u0432\u0441\u0435\u0439 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443 \u043f\u0430\u043c\u044f\u0442\u0438.","og:url":"https:\/\/prohoster.info\/pt\/blog\/news\/ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-06-04T12:48:20+00:00","article:modified_time":"2026-06-04T12:48:20+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/181899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/comments?post=181899"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/181899\/revisions"}],"predecessor-version":[{"id":182084,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/181899\/revisions\/182084"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=181899"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=181899"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=181899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}