{"cve":{"cve_id":"CVE-2025-62727","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":0.00597,"epss_percentile":0.43915,"epss_as_of":"2026-06-23","description":"Starlette is a lightweight ASGI framework/toolkit. Starting in version 0.39.0 and prior to version 0.49.1 , an unauthenticated attacker can send a crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic. This enables CPU exhaustion per request, causing denial‑of‑service for endpoints serving files (e.g., StaticFiles or any use of FileResponse). This vulnerability is fixed in 0.49.1.","published_at":"2025-10-28T20:14:53.655000Z","last_modified_at":null,"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":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-407"],"nvd_references":["https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8","https://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5","https://github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3c","https://github.com/Kludex/starlette/releases/tag/0.49.1"],"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":"2026-06-28T23:28:02.276974Z"},"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":"kludex","vendor_name":"Kludex","product_slug":"starlette","product_name":"starlette","version_start":">= 0.39.0, < 0.49.1","version_start_inclusive":true,"version_end":">= 0.39.0, < 0.49.1","version_end_inclusive":true,"cpe23_uri":"cve5:kludex:starlette:>= 0.39.0, < 0.49.1:>= 0.39.0, < 0.49.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3c","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/Kludex/starlette/releases/tag/0.49.1","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2025-10-28T20:14:53.655000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:48:46.883421Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:48:46.883421Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:48:46.883421Z","label":"CVSS score revised","source":"cvelistv5"}]}