{"cve":{"cve_id":"CVE-2026-27125","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":0.00377,"epss_percentile":0.29375,"epss_as_of":"2026-06-23","description":"svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.","published_at":"2026-02-20T22:29:45.364000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":5.3,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N","cvss_v4_severity":"MEDIUM","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-915"],"nvd_references":["https://github.com/sveltejs/svelte/security/advisories/GHSA-crpf-4hrx-3jrp","https://github.com/sveltejs/svelte/commit/73098bb26c6f06e7fd1b0746d817d2c5ee90755f","https://github.com/sveltejs/svelte/releases/tag/svelte@5.51.5"],"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":"2026-06-28T23:29:30.893166Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"AT","name":"Attack Requirements","value":"P","value_label":"Present"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"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":"N","value_label":"None"}]},"affected":[{"vendor_slug":"sveltejs","vendor_name":"sveltejs","product_slug":"svelte","product_name":"svelte","version_start":"< 5.51.5","version_start_inclusive":true,"version_end":"< 5.51.5","version_end_inclusive":true,"cpe23_uri":"cve5:sveltejs:svelte:< 5.51.5:< 5.51.5"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/sveltejs/svelte/security/advisories/GHSA-crpf-4hrx-3jrp","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/sveltejs/svelte/commit/73098bb26c6f06e7fd1b0746d817d2c5ee90755f","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/sveltejs/svelte/releases/tag/svelte@5.51.5","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-02-20T22:29:45.364000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:52:17.441167Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:17.441167Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:17.441167Z","label":"CVSS score revised","source":"cvelistv5"}]}