{"cve":{"cve_id":"CVE-2026-64607","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":0.00464,"epss_percentile":0.38711,"epss_as_of":"2026-10-15","description":"HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported `Content-Encoding` header value in the response message. Please note this defect does not affect HttpClient based on the async i/o model.\n\nThis issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2.","published_at":"2026-07-31T10:12:18.035000Z","last_modified_at":"2026-10-23T23:10:00.157000Z","cvss_v3_score":5.3,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-772"],"nvd_references":["https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q"],"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":"2026-07-31T11:17:26.055757Z","updated_at":"2026-10-25T04:48:26.967327Z"},"effective_severity":"MEDIUM","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":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"apache","vendor_name":"apache","product_slug":"httpclient","product_name":"httpclient","version_start":"5.0.0","version_start_inclusive":true,"version_end":"5.6.3","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-httpcomponents-client","product_name":"Apache HttpComponents Client","version_start":"5.0-alpha","version_start_inclusive":true,"version_end":"5.6.2","version_end_inclusive":true,"cpe23_uri":"cve5:apache-software-foundation:apache-httpcomponents-client:5.0-alpha:5.6.2"}],"exploit_refs":[],"news":[],"references":[{"url":"https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q","source_type":"MAILING_LIST","tags":["mailing-list"]}],"timeline":[{"type":"published","at":"2026-07-31T10:12:18.035000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-07-31T17:17:26.043574Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-07-31T17:17:26.043574Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-07-31T17:17:26.043574Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"ssvc_changed","at":"2026-07-31T18:18:26.046167Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-31T18:18:26.046167Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-31T18:18:26.046167Z","label":"SSVC decision revised","source":"vulnrichment"}]}