{"schema_version":1,"title":"Rack vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 17 vulnerabilities in Rack: 2 in the last 7 days and 2 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-125111, was published on 9 November 2026. Nothing was published in the last eight weeks.","url":"https://junglewise.ai/threats/vendors/rack","json_url":"https://junglewise.ai/threats/vendors/rack.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/vendors/rack","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"vendor","thin":false,"counts":{"high":6,"all_time":17,"critical":1,"exploited":0,"last_7_days":2,"last_30_days":2,"last_90_days":2,"last_365_days":17},"latest":[{"cve":"CVE-2026-125111","cvss":7.5,"epss":0.0037,"slug":"cve-2026-125111-rack-multipart-parsing-allows-dos-via-unbounded-scan-buffer","title":"Rack multipart parser denial of service via unbounded scan buffer growth","severity":"high","exploited":false,"published_at":"2026-11-09T22:18:42.433+00:00","url":"https://junglewise.ai/threats/cve-2026-125111-rack-multipart-parsing-allows-dos-via-unbounded-scan-buffer"},{"cve":"CVE-2026-125109","cvss":4.8,"epss":0.0022,"slug":"cve-2026-125109-rack-is-a-modular-ruby-web-server-interface-from-3-0-until-3-1","title":"Rack host validation bypass via HTTP headers","severity":"medium","exploited":false,"published_at":"2026-11-09T22:18:42.127+00:00","url":"https://junglewise.ai/threats/cve-2026-125109-rack-is-a-modular-ruby-web-server-interface-from-3-0-until-3-1"},{"cve":"CVE-2026-39324","cvss":9.8,"epss":0.0027,"slug":"cve-2026-39324-rack-rack-session-auth-bypass-and-deserialization-in-session","title":"Rack rack-session auth bypass and deserialization in Session Cookie","severity":"critical","exploited":false,"published_at":"2026-04-07T18:16:43.387+00:00","url":"https://junglewise.ai/threats/cve-2026-39324-rack-rack-session-auth-bypass-and-deserialization-in-session"},{"cve":"CVE-2026-34835","cvss":4.8,"epss":0.0028,"slug":"cve-2026-34835-rack-rack-request-host-allowlist-bypass-via-host-header-poisoning","title":"Rack Rack::Request host allowlist bypass via Host header poisoning","severity":"medium","exploited":false,"published_at":"2026-04-02T18:16:33.967+00:00","url":"https://junglewise.ai/threats/cve-2026-34835-rack-rack-request-host-allowlist-bypass-via-host-header-poisoning"},{"cve":"CVE-2026-34827","cvss":7.5,"epss":0.0066,"slug":"cve-2026-34827-rack-algorithmic-complexity-denial-of-service-in-multipart-parser","title":"Rack algorithmic complexity denial of service in Multipart Parser","severity":"high","exploited":false,"published_at":"2026-04-02T18:16:33.49+00:00","url":"https://junglewise.ai/threats/cve-2026-34827-rack-algorithmic-complexity-denial-of-service-in-multipart-parser"},{"cve":"CVE-2026-32762","cvss":4.8,"epss":0.0025,"slug":"cve-2026-32762-rack-interpretation-conflict-in-forwarded-header-parsing","title":"Rack interpretation conflict in Forwarded header parsing","severity":"medium","exploited":false,"published_at":"2026-04-02T18:16:27.73+00:00","url":"https://junglewise.ai/threats/cve-2026-32762-rack-interpretation-conflict-in-forwarded-header-parsing"},{"cve":"CVE-2026-26962","cvss":4.8,"epss":0.0025,"slug":"cve-2026-26962-rack-crlf-injection-in-rack-multipart-parser","title":"Rack CRLF injection in Rack::Multipart::Parser","severity":"medium","exploited":false,"published_at":"2026-04-02T18:16:26.773+00:00","url":"https://junglewise.ai/threats/cve-2026-26962-rack-crlf-injection-in-rack-multipart-parser"},{"cve":"CVE-2026-34831","cvss":4.8,"epss":0.0025,"slug":"cve-2026-34831-rack-incorrect-content-length-calculation-in-rack-files-error","title":"Rack incorrect Content-Length calculation in Rack::Files error responses","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:26.42+00:00","url":"https://junglewise.ai/threats/cve-2026-34831-rack-incorrect-content-length-calculation-in-rack-files-error"},{"cve":"CVE-2026-34830","cvss":5.9,"epss":0.004,"slug":"cve-2026-34830-rack-rack-regular-expression-injection-in-rack-sendfile","title":"Rack Rack regular expression injection in Rack::Sendfile","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:26.267+00:00","url":"https://junglewise.ai/threats/cve-2026-34830-rack-rack-regular-expression-injection-in-rack-sendfile"},{"cve":"CVE-2026-34829","cvss":7.5,"epss":0.0066,"slug":"cve-2026-34829-rack-uncontrolled-resource-consumption-in-rack-multipart-parser","title":"Rack uncontrolled resource consumption in Rack::Multipart::Parser","severity":"high","exploited":false,"published_at":"2026-04-02T17:16:26.103+00:00","url":"https://junglewise.ai/threats/cve-2026-34829-rack-uncontrolled-resource-consumption-in-rack-multipart-parser"},{"cve":"CVE-2026-34826","cvss":5.3,"epss":0.0046,"slug":"cve-2026-34826-rack-denial-of-service-via-excessive-overlapping-http-byte-ranges","title":"Rack denial of service via excessive overlapping HTTP byte ranges","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:25.88+00:00","url":"https://junglewise.ai/threats/cve-2026-34826-rack-denial-of-service-via-excessive-overlapping-http-byte-ranges"},{"cve":"CVE-2026-34786","cvss":5.3,"epss":0.0033,"slug":"cve-2026-34786-rack-rack-static-security-header-bypass-via-url-encoded-paths","title":"Rack Rack::Static security header bypass via URL-encoded paths","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:25.03+00:00","url":"https://junglewise.ai/threats/cve-2026-34786-rack-rack-static-security-header-bypass-via-url-encoded-paths"},{"cve":"CVE-2026-34785","cvss":7.5,"epss":0.0052,"slug":"cve-2026-34785-rack-rack-static-information-disclosure-via-partial-string","title":"Rack Rack::Static information disclosure via partial string matching","severity":"high","exploited":false,"published_at":"2026-04-02T17:16:24.873+00:00","url":"https://junglewise.ai/threats/cve-2026-34785-rack-rack-static-information-disclosure-via-partial-string"},{"cve":"CVE-2026-34763","cvss":5.3,"epss":0.0033,"slug":"cve-2026-34763-rack-rack-directory-information-disclosure-via-unescaped-regex","title":"Rack Rack::Directory information disclosure via unescaped regex interpolation","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:24.723+00:00","url":"https://junglewise.ai/threats/cve-2026-34763-rack-rack-directory-information-disclosure-via-unescaped-regex"},{"cve":"CVE-2026-34230","cvss":7.5,"epss":0.0048,"slug":"cve-2026-34230-rack-inefficient-algorithmic-complexity-in-rack-utils-select-best","title":"Rack inefficient algorithmic complexity in Rack::Utils.select_best_encoding","severity":"high","exploited":false,"published_at":"2026-04-02T17:16:23.57+00:00","url":"https://junglewise.ai/threats/cve-2026-34230-rack-inefficient-algorithmic-complexity-in-rack-utils-select-best"},{"cve":"CVE-2026-26961","cvss":5.3,"epss":0.0027,"slug":"cve-2026-26961-rack-interpretation-conflict-in-multipart-parser-boundary","title":"Rack interpretation conflict in Multipart Parser boundary extraction","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:21.973+00:00","url":"https://junglewise.ai/threats/cve-2026-26961-rack-interpretation-conflict-in-multipart-parser-boundary"},{"cve":"CVE-2026-22860","cvss":7.5,"epss":0.0068,"slug":"cve-2026-22860-rack-directory-traversal-in-rack-directory","title":"Rack directory traversal in Rack::Directory","severity":"high","exploited":false,"published_at":"2026-02-18T19:21:43.933+00:00","url":"https://junglewise.ai/threats/cve-2026-22860-rack-directory-traversal-in-rack-directory"}],"vendor":{"hub":true,"name":"Rack","slug":"rack","description":"Ruby web application framework for building web services.","url":"https://junglewise.ai/threats/vendors/rack"},"weekly":[{"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":0},{"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},{"week":"2026-09-28","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-05","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-12","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-19","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-26","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-11-02","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-11-09","critical":0,"exploited":0,"vulnerabilities":2}],"most_severe":[{"cve":"CVE-2026-39324","cvss":9.8,"epss":0.0027,"slug":"cve-2026-39324-rack-rack-session-auth-bypass-and-deserialization-in-session","title":"Rack rack-session auth bypass and deserialization in Session Cookie","severity":"critical","exploited":false,"published_at":"2026-04-07T18:16:43.387+00:00","url":"https://junglewise.ai/threats/cve-2026-39324-rack-rack-session-auth-bypass-and-deserialization-in-session"},{"cve":"CVE-2026-22860","cvss":7.5,"epss":0.0068,"slug":"cve-2026-22860-rack-directory-traversal-in-rack-directory","title":"Rack directory traversal in Rack::Directory","severity":"high","exploited":false,"published_at":"2026-02-18T19:21:43.933+00:00","url":"https://junglewise.ai/threats/cve-2026-22860-rack-directory-traversal-in-rack-directory"},{"cve":"CVE-2026-34827","cvss":7.5,"epss":0.0066,"slug":"cve-2026-34827-rack-algorithmic-complexity-denial-of-service-in-multipart-parser","title":"Rack algorithmic complexity denial of service in Multipart Parser","severity":"high","exploited":false,"published_at":"2026-04-02T18:16:33.49+00:00","url":"https://junglewise.ai/threats/cve-2026-34827-rack-algorithmic-complexity-denial-of-service-in-multipart-parser"},{"cve":"CVE-2026-34829","cvss":7.5,"epss":0.0066,"slug":"cve-2026-34829-rack-uncontrolled-resource-consumption-in-rack-multipart-parser","title":"Rack uncontrolled resource consumption in Rack::Multipart::Parser","severity":"high","exploited":false,"published_at":"2026-04-02T17:16:26.103+00:00","url":"https://junglewise.ai/threats/cve-2026-34829-rack-uncontrolled-resource-consumption-in-rack-multipart-parser"},{"cve":"CVE-2026-34785","cvss":7.5,"epss":0.0052,"slug":"cve-2026-34785-rack-rack-static-information-disclosure-via-partial-string","title":"Rack Rack::Static information disclosure via partial string matching","severity":"high","exploited":false,"published_at":"2026-04-02T17:16:24.873+00:00","url":"https://junglewise.ai/threats/cve-2026-34785-rack-rack-static-information-disclosure-via-partial-string"},{"cve":"CVE-2026-34230","cvss":7.5,"epss":0.0048,"slug":"cve-2026-34230-rack-inefficient-algorithmic-complexity-in-rack-utils-select-best","title":"Rack inefficient algorithmic complexity in Rack::Utils.select_best_encoding","severity":"high","exploited":false,"published_at":"2026-04-02T17:16:23.57+00:00","url":"https://junglewise.ai/threats/cve-2026-34230-rack-inefficient-algorithmic-complexity-in-rack-utils-select-best"},{"cve":"CVE-2026-125111","cvss":7.5,"epss":0.0037,"slug":"cve-2026-125111-rack-multipart-parsing-allows-dos-via-unbounded-scan-buffer","title":"Rack multipart parser denial of service via unbounded scan buffer growth","severity":"high","exploited":false,"published_at":"2026-11-09T22:18:42.433+00:00","url":"https://junglewise.ai/threats/cve-2026-125111-rack-multipart-parsing-allows-dos-via-unbounded-scan-buffer"},{"cve":"CVE-2026-34830","cvss":5.9,"epss":0.004,"slug":"cve-2026-34830-rack-rack-regular-expression-injection-in-rack-sendfile","title":"Rack Rack regular expression injection in Rack::Sendfile","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:26.267+00:00","url":"https://junglewise.ai/threats/cve-2026-34830-rack-rack-regular-expression-injection-in-rack-sendfile"},{"cve":"CVE-2026-34826","cvss":5.3,"epss":0.0046,"slug":"cve-2026-34826-rack-denial-of-service-via-excessive-overlapping-http-byte-ranges","title":"Rack denial of service via excessive overlapping HTTP byte ranges","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:25.88+00:00","url":"https://junglewise.ai/threats/cve-2026-34826-rack-denial-of-service-via-excessive-overlapping-http-byte-ranges"},{"cve":"CVE-2026-34786","cvss":5.3,"epss":0.0033,"slug":"cve-2026-34786-rack-rack-static-security-header-bypass-via-url-encoded-paths","title":"Rack Rack::Static security header bypass via URL-encoded paths","severity":"medium","exploited":false,"published_at":"2026-04-02T17:16:25.03+00:00","url":"https://junglewise.ai/threats/cve-2026-34786-rack-rack-static-security-header-bypass-via-url-encoded-paths"}],"generated_at":"2026-11-12T20:07:00.160596+00:00","technologies":[]}