{"cve":{"cve_id":"CVE-2026-42462","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":0.00171,"epss_percentile":0.06647,"epss_as_of":"2026-06-23","description":"Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.","published_at":"2026-06-10T20:22:35.383000Z","last_modified_at":null,"cvss_v3_score":7.0,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-180","CWE-347","CWE-436","CWE-1289"],"nvd_references":["https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367","https://github.com/fedify-dev/fedify/releases/tag/2.2.3"],"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":"2026-06-28T23:30:20.145142Z"},"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":"H","value_label":"High"},{"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":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"fedify-dev","vendor_name":"fedify-dev","product_slug":"fedify","product_name":"fedify","version_start":">= 2.2.0, < 2.2.3","version_start_inclusive":true,"version_end":">= 2.2.0, < 2.2.3","version_end_inclusive":true,"cpe23_uri":"cve5:fedify-dev:fedify:>= 2.2.0, < 2.2.3:>= 2.2.0, < 2.2.3"},{"vendor_slug":"fedify-dev","vendor_name":"fedify-dev","product_slug":"fedify","product_name":"fedify","version_start":">= 2.1.0, < 2.1.14","version_start_inclusive":true,"version_end":">= 2.1.0, < 2.1.14","version_end_inclusive":true,"cpe23_uri":"cve5:fedify-dev:fedify:>= 2.1.0, < 2.1.14:>= 2.1.0, < 2.1.14"},{"vendor_slug":"fedify-dev","vendor_name":"fedify-dev","product_slug":"fedify","product_name":"fedify","version_start":">= 2.0.0, < 2.0.18","version_start_inclusive":true,"version_end":">= 2.0.0, < 2.0.18","version_end_inclusive":true,"cpe23_uri":"cve5:fedify-dev:fedify:>= 2.0.0, < 2.0.18:>= 2.0.0, < 2.0.18"},{"vendor_slug":"fedify-dev","vendor_name":"fedify-dev","product_slug":"fedify","product_name":"fedify","version_start":">= 1.10.0, < 1.10.10","version_start_inclusive":true,"version_end":">= 1.10.0, < 1.10.10","version_end_inclusive":true,"cpe23_uri":"cve5:fedify-dev:fedify:>= 1.10.0, < 1.10.10:>= 1.10.0, < 1.10.10"},{"vendor_slug":"fedify-dev","vendor_name":"fedify-dev","product_slug":"fedify","product_name":"fedify","version_start":"< 1.9.11","version_start_inclusive":true,"version_end":"< 1.9.11","version_end_inclusive":true,"cpe23_uri":"cve5:fedify-dev:fedify:< 1.9.11:< 1.9.11"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/fedify-dev/fedify/releases/tag/2.2.3","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-10T20:22:35.383000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"}]}