{"id":184003,"date":"2026-10-26T11:41:01","date_gmt":"2026-10-26T09:41:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/uyazvimost-v-ruby-ekspluatiruemaya-dlya-udalyonnogo-vypolneniya-koda-v-gitlab"},"modified":"2026-10-26T11:41:08","modified_gmt":"2026-10-26T09:41:08","slug":"ruby-vulnerability-exploited-for-remote-code-execution-in-gitlab","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/ruby-vulnerability-exploited-for-remote-code-execution-in-gitlab","title":{"rendered":"Zranitelnost v Ruby, zneu\u017e\u00edvan\u00e1 pro vzd\u00e1len\u00e9 prov\u00e1d\u011bn\u00ed k\u00f3du v GitLabu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byly zve\u0159ejn\u011bny opravy programovac\u00edho jazyka Ruby 3.3.13, 3.4.12 a 4.0.9, kter\u00e9 odstra\u0148uj\u00ed kritickou zranitelnost (CVE-2026-110264), vedouc\u00ed k p\u0159ete\u010den\u00ed celo\u010d\u00edseln\u00e9ho typu p\u0159i kompilaci speci\u00e1ln\u011b formulovan\u00fdch regul\u00e1rn\u00edch v\u00fdraz\u016f. Tato zranitelnost m\u016f\u017ee b\u00fdt zneu\u017eita k \u00fatok\u016fm na projekty napsan\u00e9 v Ruby, kter\u00e9 pou\u017e\u00edvaj\u00ed extern\u00ed data v regul\u00e1rn\u00edch v\u00fdrazech. Mezi jin\u00fdm byla potvrzena mo\u017enost zneu\u017eit\u00ed zranitelnosti pro vzd\u00e1len\u00e9 prov\u00e1d\u011bn\u00ed k\u00f3du na platform\u011b pro spolupr\u00e1ci GitLab. Probl\u00e9m byl d\u00e1le blokov\u00e1n v aktualizac\u00edch GitLab 19.5.1, 19.4.3, 19.3.6, 19.2.9, 19.1.9, 19.0.10 a 18.11.13. Zranitelnosti byla p\u0159id\u011blena \u00farove\u0148 nebezpe\u010d\u00ed 10 z 10. <\/p>\n

Zranitelnost se nach\u00e1z\u00ed v motoru regul\u00e1rn\u00edch v\u00fdraz\u016f Onigmo a vede k p\u0159ete\u010den\u00ed intern\u00edch identifik\u00e1tor\u016f p\u0159i kompilaci vzoru s velk\u00fdm po\u010dtem opakov\u00e1n\u00ed. Probl\u00e9m se projevuje pouze v aplikac\u00edch, kter\u00e9 pou\u017e\u00edvaj\u00ed extern\u00ed data v regul\u00e1rn\u00edch v\u00fdrazech zpracovan\u00fdch prost\u0159ednictv\u00edm metod Regexp.new, Regexp.union a Regexp.compile nebo liter\u00e1l\u016f ve tvaru «\\\/#{input}». Omezen\u00ed velikosti regul\u00e1rn\u00edho v\u00fdrazu nebo \u010dasu jeho zpracov\u00e1n\u00ed pomoc\u00ed metody Regexp.timeout nezablokuje zranitelnost, proto\u017ee pro \u00fatok lze pou\u017e\u00edt kr\u00e1tk\u00e9 vzory. <\/p>\n

V GitLab m\u016f\u017ee b\u00fdt zranitelnost zneu\u017eita neautentizovan\u00fdm u\u017eivatelem kv\u016fli substituci extern\u00edch dat do regul\u00e1rn\u00edho v\u00fdrazu. Podrobnosti o metod\u011b zneu\u017eit\u00ed zat\u00edm nebyly zve\u0159ejn\u011bny (dle pravidel GitLab jsou informace dostupn\u00e9 a\u017e 30 dn\u00ed po zve\u0159ejn\u011bn\u00ed opravy), p\u0159i\u010dem\u017e se ji\u017e v s\u00edt\u00edch zaznamen\u00e1vaj\u00ed pokusy o \u00fatoky na u\u017eivatele GitLab. Nep\u0159\u00edm\u00fdmi zn\u00e1mkami \u00fatoku mohou b\u00fdt zv\u00fd\u0161en\u00e9 po\u010dty havarijn\u00edch ukon\u010den\u00ed interpretru Ruby a vzr\u016fst chyb v log\u00e1ch souvisej\u00edc\u00edch s vypr\u0161en\u00edm \u010dasov\u00e9ho limitu na vykreslen\u00ed str\u00e1nky p\u0159i zpracov\u00e1n\u00ed org-soubor\u016f.<\/p>\n

Krom\u011b CVE-2026-110264 byly v enginu regul\u00e1rn\u00edch v\u00fdraz\u016f odstran\u011bny dal\u0161\u00ed t\u0159i zranitelnosti: CVE-2026-89078 (dvojit\u00e9 uvoln\u011bn\u00ed pam\u011bti p\u0159i nemo\u017enosti parsov\u00e1n\u00ed \u0161ablony po jej\u00ed zm\u011bn\u011b), CVE-2026-93577 a CVE-2026-97229 (p\u0159ete\u010den\u00ed celo\u010d\u00edseln\u00e9ho typu p\u0159i v\u00fdpo\u010dtu velikosti kompilovan\u00e9 \u0161ablony).
\n
Zdroj: 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":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-184003","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\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost v Ruby, vyu\u017e\u00edvan\u00e1 k vzd\u00e1len\u00e9mu prov\u00e1d\u011bn\u00ed k\u00f3du v GitLab | ProHoster","description":"Byly zve\u0159ejn\u011bny opravy programovac\u00edho jazyka Ruby 3.3.13, 3.4.12 a 4.0.9, kter\u00e9 odstra\u0148uj\u00ed kritickou zranitelnost (CVE-2026-110264), vedouc\u00ed k p\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla p\u0159i speci\u00e1ln\u00ed 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ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u044f\u0437\u044b\u043a\u0430 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f Ruby 3.3.13, 3.4.12 \u0438 4.0.9, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-110264), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043f\u0440\u0438 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0446\u0438\u0438 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