{"cve":{"cve_id":"CVE-2026-9545","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":0.00408,"epss_percentile":0.33475,"epss_as_of":"2026-10-15","description":"In this scenario, libcurl first uses a proper HTTP/3 server for the initial\ntransfers, and when it makes a second transfer to the same site it has been\nreplaced by the attacker's impostor machine - without a valid certificate.\n\nWhen libcurl returns to the hostname the second time with a cached SSL session\n(`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the\n`CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might\nsend off the second request's bytes on that new connection *before* enforcing\nthe certificate verification failure. Potentially leaking sensitive\ninformation.","published_at":"2026-07-03T06:17:55.931000Z","last_modified_at":"2026-09-15T07:16:34.947000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-200"],"nvd_references":["https://curl.se/docs/CVE-2026-9545.json","https://curl.se/docs/CVE-2026-9545.html","https://hackerone.com/reports/3752888"],"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":"2026-07-03T07:34:23.731878Z","updated_at":"2026-09-16T00:00:38.137528Z"},"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":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"962097b8dd44ed5b9e7984bc1cdffdbdd566857f","version_start_inclusive":true,"version_end":"7b9613fa9b1a5e04301a3920eef58e8138dad05e","version_end_inclusive":false,"cpe23_uri":"cve5:curl:curl:962097b8dd44ed5b9e7984bc1cdffdbdd566857f:7b9613fa9b1a5e04301a3920eef58e8138dad05e"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.19.0","version_start_inclusive":true,"version_end":"8.19.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.19.0:8.19.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.18.0","version_start_inclusive":true,"version_end":"8.18.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.18.0:8.18.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.17.0","version_start_inclusive":true,"version_end":"8.17.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.17.0:8.17.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.16.0","version_start_inclusive":true,"version_end":"8.16.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.16.0:8.16.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.15.0","version_start_inclusive":true,"version_end":"8.15.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.15.0:8.15.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.14.1","version_start_inclusive":true,"version_end":"8.14.1","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.14.1:8.14.1"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.14.0","version_start_inclusive":true,"version_end":"8.14.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.14.0:8.14.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.13.0","version_start_inclusive":true,"version_end":"8.13.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.13.0:8.13.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.12.1","version_start_inclusive":true,"version_end":"8.12.1","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.12.1:8.12.1"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.12.0","version_start_inclusive":true,"version_end":"8.12.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.12.0:8.12.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.11.1","version_start_inclusive":true,"version_end":"8.11.1","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.11.1:8.11.1"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.11.0","version_start_inclusive":true,"version_end":"8.11.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.11.0:8.11.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.20.0","version_start_inclusive":true,"version_end":"8.20.0","version_end_inclusive":true,"cpe23_uri":"cve5:curl:curl:8.20.0:8.20.0"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.11.0","version_start_inclusive":true,"version_end":"8.14.2","version_end_inclusive":false,"cpe23_uri":"cve5:curl:curl:8.11.0:8.14.2"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.15.0","version_start_inclusive":true,"version_end":"8.16.1","version_end_inclusive":false,"cpe23_uri":"cve5:curl:curl:8.15.0:8.16.1"},{"vendor_slug":"curl","vendor_name":"curl","product_slug":"curl","product_name":"curl","version_start":"8.17.0","version_start_inclusive":true,"version_end":"8.20.1","version_end_inclusive":false,"cpe23_uri":"cve5:curl:curl:8.17.0:8.20.1"},{"vendor_slug":"haxx","vendor_name":"haxx","product_slug":"curl","product_name":"curl","version_start":"8.11.0","version_start_inclusive":true,"version_end":"8.21.0","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://curl.se/docs/CVE-2026-9545.json","source_type":"MISC","tags":[]},{"url":"https://curl.se/docs/CVE-2026-9545.html","source_type":"MISC","tags":[]},{"url":"https://hackerone.com/reports/3752888","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-07-03T06:17:55.931000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-06T17:42:58.941016Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-06T17:42:58.941016Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-06T17:42:58.941016Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-07-06T17:42:58.941016Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-07-06T17:42:58.941016Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-07-06T17:42:58.941016Z","label":"CVSS score revised","source":"vulnrichment"}]}