{"schema_version":1,"title":"zlib (RubyGems) vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 3 vulnerabilities in zlib (RubyGems): 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-85091, was published on 3 September 2026.","url":"https://junglewise.ai/threats/technologies/zlib","json_url":"https://junglewise.ai/threats/technologies/zlib.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/zlib","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":2,"all_time":3,"critical":1,"exploited":0,"last_7_days":0,"last_30_days":1,"last_90_days":1,"last_365_days":3},"latest":[{"cve":"CVE-2026-85091","cvss":7.4,"epss":0.0059,"slug":"cve-2026-85091-zlib-heap-buffer-overflow-in-gz-vacate-function","title":"zlib heap buffer overflow in gz_vacate function","severity":"high","exploited":false,"published_at":"2026-09-03T13:06:20.573+00:00","url":"https://junglewise.ai/threats/cve-2026-85091-zlib-heap-buffer-overflow-in-gz-vacate-function"},{"cve":"CVE-2026-27820","cvss":9.8,"epss":0.0075,"slug":"cve-2026-27820-ruby-zlib-buffer-overflow-in-zlib-gzipreader","title":"Ruby zlib buffer overflow in Zlib::GzipReader","severity":"critical","exploited":false,"published_at":"2026-04-16T18:16:44.77+00:00","url":"https://junglewise.ai/threats/cve-2026-27820-ruby-zlib-buffer-overflow-in-zlib-gzipreader"},{"cve":"CVE-2026-22184","cvss":7.8,"epss":0.0021,"slug":"cve-2026-22184-zlib-global-buffer-overflow-in-untgz-utility","title":"zlib global buffer overflow in untgz utility","severity":"high","exploited":false,"published_at":"2026-01-07T21:16:01.563+00:00","url":"https://junglewise.ai/threats/cve-2026-22184-zlib-global-buffer-overflow-in-untgz-utility"}],"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":1},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"nokogiri (RubyGems)","slug":"nokogiri","vulnerabilities":27,"url":"https://junglewise.ai/threats/technologies/nokogiri"},{"name":"rack (RubyGems)","slug":"rack","vulnerabilities":14,"url":"https://junglewise.ai/threats/technologies/rack"},{"name":"oj (RubyGems)","slug":"oj","vulnerabilities":11,"url":"https://junglewise.ai/threats/technologies/oj"},{"name":"jquery-rails (RubyGems)","slug":"jquery-rails","vulnerabilities":9,"url":"https://junglewise.ai/threats/technologies/jquery-rails"},{"name":"jquery-ui-rails (RubyGems)","slug":"jquery-ui-rails","vulnerabilities":8,"url":"https://junglewise.ai/threats/technologies/jquery-ui-rails"},{"name":"openc3 (RubyGems)","slug":"openc3","vulnerabilities":8,"url":"https://junglewise.ai/threats/technologies/openc3"},{"name":"lodash-rails (RubyGems)","slug":"lodash-rails","vulnerabilities":7,"url":"https://junglewise.ai/threats/technologies/lodash-rails"},{"name":"net-imap (RubyGems)","slug":"net-imap","vulnerabilities":7,"url":"https://junglewise.ai/threats/technologies/net-imap"},{"name":"loofah (RubyGems)","slug":"loofah","vulnerabilities":6,"url":"https://junglewise.ai/threats/technologies/loofah"},{"name":"action_text-trix (RubyGems)","slug":"action-text-trix","vulnerabilities":5,"url":"https://junglewise.ai/threats/technologies/action-text-trix"},{"name":"camaleon_cms (RubyGems)","slug":"camaleon-cms","vulnerabilities":4,"url":"https://junglewise.ai/threats/technologies/camaleon-cms"},{"name":"fluentd (RubyGems)","slug":"fluentd","vulnerabilities":4,"url":"https://junglewise.ai/threats/technologies/fluentd"}],"technology":{"hub":true,"name":"zlib (RubyGems)","slug":"zlib","vendor":{"name":"RubyGems","slug":"rubygems","url":"https://junglewise.ai/threats/vendors/rubygems"},"aliases":[],"homepage":"https://rubygems.org/gems/zlib","repo_url":"https://github.com/ruby/zlib","description":"This Ruby gem provides an interface to the zlib compression library.","url":"https://junglewise.ai/threats/technologies/zlib"},"most_severe":[{"cve":"CVE-2026-27820","cvss":9.8,"epss":0.0075,"slug":"cve-2026-27820-ruby-zlib-buffer-overflow-in-zlib-gzipreader","title":"Ruby zlib buffer overflow in Zlib::GzipReader","severity":"critical","exploited":false,"published_at":"2026-04-16T18:16:44.77+00:00","url":"https://junglewise.ai/threats/cve-2026-27820-ruby-zlib-buffer-overflow-in-zlib-gzipreader"},{"cve":"CVE-2026-22184","cvss":7.8,"epss":0.0021,"slug":"cve-2026-22184-zlib-global-buffer-overflow-in-untgz-utility","title":"zlib global buffer overflow in untgz utility","severity":"high","exploited":false,"published_at":"2026-01-07T21:16:01.563+00:00","url":"https://junglewise.ai/threats/cve-2026-22184-zlib-global-buffer-overflow-in-untgz-utility"},{"cve":"CVE-2026-85091","cvss":7.4,"epss":0.0059,"slug":"cve-2026-85091-zlib-heap-buffer-overflow-in-gz-vacate-function","title":"zlib heap buffer overflow in gz_vacate function","severity":"high","exploited":false,"published_at":"2026-09-03T13:06:20.573+00:00","url":"https://junglewise.ai/threats/cve-2026-85091-zlib-heap-buffer-overflow-in-gz-vacate-function"}],"generated_at":"2026-09-26T17:07:00.185783+00:00"}