{"cve":{"cve_id":"CVE-2026-59823","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":0.00439,"epss_percentile":0.36629,"epss_as_of":"2026-10-15","description":"LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.9, an authenticated LiteLLM Proxy caller with a valid virtual key can place api_base inside the user_config request body to bypass is_request_body_safe, which blocks top-level api_base and base_url but previously did not inspect or reject user_config. Because user_config constructs the outbound router, the nested destination redirects a server-side request to an internal or external host selected by the caller and can expose endpoints the caller cannot otherwise access. This issue is fixed in version 1.83.9.","published_at":"2026-09-16T18:36:21.105000Z","last_modified_at":"2026-09-30T17:43:24.057000Z","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:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","cvss_v4_severity":"MEDIUM","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-918"],"nvd_references":["https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f","https://github.com/BerriAI/litellm/pull/25827","https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427"],"vuln_status":"Awaiting Analysis","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":"2026-09-16T19:03:42.088877Z","updated_at":"2026-10-02T10:03:01.593453Z"},"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":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"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":"N","value_label":"None"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"L","value_label":"Low"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"berriai","vendor_name":"BerriAI","product_slug":"litellm","product_name":"litellm","version_start":"< 1.83.9","version_start_inclusive":true,"version_end":"< 1.83.9","version_end_inclusive":true,"cpe23_uri":"cve5:berriai:litellm:< 1.83.9:< 1.83.9"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/BerriAI/litellm/pull/25827","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-09-16T18:36:21.105000Z","label":"CVE published","source":null}]}