{"cve":{"cve_id":"CVE-2026-5818","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":null,"epss_percentile":null,"epss_as_of":null,"description":"Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update.\n\nThis issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.","published_at":"2026-06-23T23:50:06.556000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":7.2,"cvss_v4_vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-253"],"nvd_references":["https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq"],"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":"2026-06-28T17:55:48.239489Z","updated_at":"2026-06-28T23:30:59.112346Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"A","value_label":"Adjacent"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"P","value_label":"Present"},{"metric":"PR","name":"Privileges Required","value":"H","value_label":"High"},{"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":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"H","value_label":"High"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"H","value_label":"High"},{"metric":"SA","name":"Availability (Subsequent System)","value":"H","value_label":"High"}]},"affected":[{"vendor_slug":"caliptra","vendor_name":"Caliptra","product_slug":"core-runtime-firmware","product_name":"Core Runtime Firmware","version_start":"2.0.0","version_start_inclusive":true,"version_end":"2.0.1","version_end_inclusive":true,"cpe23_uri":"cve5:caliptra:core-runtime-firmware:2.0.0:2.0.1"},{"vendor_slug":"caliptra","vendor_name":"Caliptra","product_slug":"core-runtime-firmware","product_name":"Core Runtime Firmware","version_start":"2.1.0","version_start_inclusive":true,"version_end":"2.1.0","version_end_inclusive":true,"cpe23_uri":"cve5:caliptra:core-runtime-firmware:2.1.0:2.1.0"},{"vendor_slug":"caliptra","vendor_name":"Caliptra","product_slug":"core-runtime-firmware","product_name":"Core Runtime Firmware","version_start":"2.0.2","version_start_inclusive":true,"version_end":"2.0.2","version_end_inclusive":true,"cpe23_uri":"cve5:caliptra:core-runtime-firmware:2.0.2:2.0.2"},{"vendor_slug":"caliptra","vendor_name":"Caliptra","product_slug":"core-runtime-firmware","product_name":"Core Runtime Firmware","version_start":"2.1.1","version_start_inclusive":true,"version_end":"2.1.1","version_end_inclusive":true,"cpe23_uri":"cve5:caliptra:core-runtime-firmware:2.1.1:2.1.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-06-23T23:50:06.556000Z","label":"CVE published","source":null}]}