{"cve":{"cve_id":"CVE-2026-56853","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":0.00568,"epss_percentile":0.44596,"epss_as_of":"2026-08-26","description":"When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.","published_at":"2026-08-13T21:58:53.092000Z","last_modified_at":"2026-08-14T16:16:57.210000Z","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":"none","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-770"],"nvd_references":["https://go.dev/issue/80205","https://go.dev/cl/795540","https://groups.google.com/g/golang-announce/c/94pEornpRlI","https://pkg.go.dev/vuln/GO-2026-6089"],"vuln_status":"Received","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":"2026-08-13T23:20:52.866618Z","updated_at":"2026-08-15T19:11:26.492639Z"},"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":"go-standard-library","vendor_name":"Go standard library","product_slug":"net-http","product_name":"net/http","version_start":"0","version_start_inclusive":true,"version_end":"1.25.13","version_end_inclusive":false,"cpe23_uri":"cve5:go-standard-library:net-http:0:1.25.13"},{"vendor_slug":"go-standard-library","vendor_name":"Go standard library","product_slug":"net-http","product_name":"net/http","version_start":"1.26.0-0","version_start_inclusive":true,"version_end":"1.26.6","version_end_inclusive":false,"cpe23_uri":"cve5:go-standard-library:net-http:1.26.0-0:1.26.6"},{"vendor_slug":"go-standard-library","vendor_name":"Go standard library","product_slug":"net-http","product_name":"net/http","version_start":"1.27.0-0","version_start_inclusive":true,"version_end":"1.27.0-rc.3","version_end_inclusive":false,"cpe23_uri":"cve5:go-standard-library:net-http:1.27.0-0:1.27.0-rc.3"}],"exploit_refs":[],"news":[],"references":[{"url":"https://go.dev/issue/80205","source_type":"MISC","tags":[]},{"url":"https://go.dev/cl/795540","source_type":"MISC","tags":[]},{"url":"https://groups.google.com/g/golang-announce/c/94pEornpRlI","source_type":"MISC","tags":[]},{"url":"https://pkg.go.dev/vuln/GO-2026-6089","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-08-13T21:58:53.092000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-08-14T16:21:52.868909Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-14T16:21:52.868909Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-14T16:21:52.868909Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-08-14T16:21:52.868909Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-08-14T16:21:52.868909Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-08-14T16:21:52.868909Z","label":"CVSS score revised","source":"vulnrichment"}]}