{"cve":{"cve_id":"CVE-2026-55602","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":0.00395,"epss_percentile":0.31243,"epss_as_of":"2026-06-23","description":"http-proxy-middleware is node.js http-proxy middleware. From 0.16.0 until 2.0.10, 3.0.6, and 4.1.0, http-proxy-middleware documents router proxy-table entries as host, path, or host+path selectors, but the host+path implementation uses unanchored substring matching on attacker-controlled request metadata. As a result, a crafted Host header that is only a superstring match for a configured host+path key can still route a request to an unintended backend. This vulnerability is fixed in 2.0.10, 3.0.6, and 4.1.0.","published_at":"2026-06-22T15:58:08.699000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":6.9,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","cvss_v4_severity":"MEDIUM","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-20","CWE-187"],"nvd_references":["https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj"],"vuln_status":null,"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":"2026-06-28T23:30:55.940411Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"chimurai","vendor_name":"chimurai","product_slug":"http-proxy-middleware","product_name":"http-proxy-middleware","version_start":">= 4.0.0, < 4.1.0","version_start_inclusive":true,"version_end":">= 4.0.0, < 4.1.0","version_end_inclusive":true,"cpe23_uri":"cve5:chimurai:http-proxy-middleware:>= 4.0.0, < 4.1.0:>= 4.0.0, < 4.1.0"},{"vendor_slug":"chimurai","vendor_name":"chimurai","product_slug":"http-proxy-middleware","product_name":"http-proxy-middleware","version_start":">= 3.0.0, < 3.0.6","version_start_inclusive":true,"version_end":">= 3.0.0, < 3.0.6","version_end_inclusive":true,"cpe23_uri":"cve5:chimurai:http-proxy-middleware:>= 3.0.0, < 3.0.6:>= 3.0.0, < 3.0.6"},{"vendor_slug":"chimurai","vendor_name":"chimurai","product_slug":"http-proxy-middleware","product_name":"http-proxy-middleware","version_start":">= 0.16.0, < 2.0.10","version_start_inclusive":true,"version_end":">= 0.16.0, < 2.0.10","version_end_inclusive":true,"cpe23_uri":"cve5:chimurai:http-proxy-middleware:>= 0.16.0, < 2.0.10:>= 0.16.0, < 2.0.10"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-06-22T15:58:08.699000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:55:37.240342Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:55:37.240342Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:55:37.240342Z","label":"CVSS score revised","source":"cvelistv5"}]}