{"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\/cs\/blog\/news\/ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati","title":{"rendered":"\u00datok na implementace HTTP\/2, vedouc\u00ed k vy\u010derp\u00e1n\u00ed dostupn\u00e9 pam\u011bti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byla zve\u0159ejn\u011bna informace o zranitelnosti \u201eHTTP\/2 Bomb\u201c, kter\u00e1 se t\u00fdk\u00e1 r\u016fzn\u00fdch implementac\u00ed protokolu HTTP\/2 a umo\u017e\u0148uje dos\u00e1hnout odm\u00edtnut\u00ed slu\u017eby vy\u010derp\u00e1n\u00edm ve\u0161ker\u00e9 dostupn\u00e9 pam\u011bti procesu. P\u0159\u00edtomnost probl\u00e9mu byla potvrzena v HTTP serverech nginx, Apache httpd (CVE-2026-49975), Microsoft IIS, Envoy (CVE-2026-47774) a Cloudflare Pingora v z\u00e1kladn\u00ed konfiguraci.<\/p>\n

Zranitelnost vyu\u017e\u00edv\u00e1 metodu podobnou zip bomb\u011b, kter\u00e1 je aplikov\u00e1na na funkci komprese hlavi\u010dek v HTTP\/2. My\u0161lenka spo\u010d\u00edv\u00e1 v tom, \u017ee po\u017eadavek m\u016f\u017ee obsahovat tis\u00edce zkomprimovan\u00fdch hlavi\u010dek, jako jsou \u201eCookie\u201c, bez p\u0159ipojen\u00fdch dat, z nich\u017e ka\u017ed\u00e1 je v po\u017eadavku \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043e\u0434\u043d\u043e\u0431\u0430\u0439\u0442\u043e\u0432\u043e\u0439 \u0441\u0441\u044b\u043b\u043a\u043e\u0439 \u0432 \u0438\u043d\u0434\u0435\u043a\u0441\u0435 HPACK, ale na serveru<\/a> vy\u017eaduje pln\u00e9 p\u0159id\u011blen\u00ed pam\u011bti pro celou hlavi\u010dku. \u00darove\u0148 spot\u0159eby pam\u011bti se na r\u016fzn\u00fdch HTTP serverech pohybuje od p\u0159ibli\u017en\u011b 70 byt\u016f na ka\u017ed\u00fd bajt v indexu pro nginx, IIS a Pingora, a\u017e po 4000 byt\u016f v Apache httpd a 5700 v Envoy. P\u0159i \u00fatoku z koncov\u00e9ho po\u010d\u00edta\u010de s p\u0159ipojen\u00edm 100 Mbps je pro vy\u010derp\u00e1n\u00ed 32 GB pam\u011bti pot\u0159eba p\u0159ibli\u017en\u011b 10 sekund p\u0159i \u00fatoku na server<\/a> s Envoy 1.37.2, 18 sekund \u2014 Apache httpd 2.4.67 a 45 sekund \u2014 nginx 1.29.7.<\/p>\n

Aby byla zranitelnost zablokov\u00e1na, byla v vyd\u00e1n\u00ed nginx 1.29.8 z projektu freenginx p\u0159enesena direktiva max_headers, kter\u00e1 ve v\u00fdchoz\u00edm nastaven\u00ed umo\u017e\u0148uje zpracov\u00e1n\u00ed maxim\u00e1ln\u011b 1000 hlavi\u010dek. Oprava v Envoy
\nje zahrnuta v verz\u00edch 1.35.11 a 1.36.7, kde byly implementov\u00e1ny limity mutable_max_request_headers_kb a max_headers_count. Oprava pro Apache httpd je navr\u017eena v modulu mod_http2 2.0.41, kter\u00fd zat\u00edm nebyl zahrnut do vyd\u00e1n\u00ed Apache httpd. Opravy pro
\nMicrosoft IIS a Cloudflare Pingora zat\u00edm nejsou k dispozici.
\nJako obch\u00e1zej\u00edc\u00ed opat\u0159en\u00ed ochrany lze vypnout pou\u017eit\u00ed protokolu HTTP\/2 a nastavit omezen\u00ed na velikost pam\u011bti dostupn\u00e9 pro pracovn\u00ed procesy.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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. \u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u043e \u0432 HTTP-\u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 nginx, Apache httpd (CVE-2026-49975), Microsoft IIS, Envoy (CVE-2026-47774) \u0438 Cloudflare Pingora \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043c\u0435\u0442\u043e\u0434, \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u044e\u0449\u0438\u0439 zip-\u0431\u043e\u043c\u0431\u0443, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u0443\u044e \u043a \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0441\u0436\u0430\u0442\u0438\u044f \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u043e\u0432 \u0432 HTTP\/2. […]<\/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\udd47\u00datok na implementace HTTP\/2, kter\u00fd vede k vy\u010derp\u00e1n\u00ed dostupn\u00e9 pam\u011bti | ProHoster","description":"Byly zve\u0159ejn\u011bny informace o zranitelnosti 'HTTP\/2 Bomb', kter\u00e1 se t\u00fdk\u00e1 r\u016fzn\u00fdch implementac\u00ed protokolu HTTP\/2 a umo\u017e\u0148uje dos\u00e1hnout \u00fatoku typu denial-of-service vy\u010derp\u00e1n\u00edm ve\u0161ker\u00e9 dostupn\u00e9 pam\u011bti procesu.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/ataka-na-realizaczii-http-2-privodyashhaya-k-ischerpaniyu-dostupnoj-pamyati","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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\/cs\/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\/cs\/wp-json\/wp\/v2\/posts\/181899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=181899"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/181899\/revisions"}],"predecessor-version":[{"id":182084,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/181899\/revisions\/182084"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=181899"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=181899"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=181899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}