{"cve":{"cve_id":"CVE-2023-22795","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.02278,"epss_percentile":0.82798,"epss_as_of":"2026-10-15","description":"A regular expression based DoS vulnerability in Action Dispatch <6.1.7.1 and <7.0.4.1 related to the If-None-Match header. A specially crafted HTTP If-None-Match header can cause the regular expression engine to enter a state of catastrophic backtracking, when on a version of Ruby below 3.2.0. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately.","published_at":"2023-02-09T00:00:00Z","last_modified_at":"2026-10-24T13:10:00.147000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-400"],"nvd_references":["https://discuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118","https://www.debian.org/security/2023/dsa-5372","https://security.netapp.com/advisory/ntap-20240202-0010/"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-10-25T02:28:23.504098Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"debian","vendor_name":"Debian","product_slug":"debian-linux","product_name":"debian_linux","version_start":"11.0","version_start_inclusive":true,"version_end":"11.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"},{"vendor_slug":"rubyonrails","vendor_name":"rubyonrails","product_slug":"rails","product_name":"rails","version_start":null,"version_start_inclusive":null,"version_end":"6.1.7.1","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://discuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118","source_type":"MISC","tags":["patch"]},{"url":"https://www.debian.org/security/2023/dsa-5372","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20240202-0010/","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2023-02-09T00:00:00Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-10-25T02:28:23.504098Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-25T02:28:23.504098Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-25T02:28:23.504098Z","label":"CVSS score revised","source":"nvd"}]}