{"cve":"CVE-2026-59823","nvd":{"published":"2026-09-16T19:17:21.377","modified":"2026-09-30T17:43:24.057","status":"Awaiting Analysis","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.","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","score":5.3},"cvss_v3":null,"cwes":["CWE-918"],"references":["https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427","https://github.com/BerriAI/litellm/pull/25827","https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-59823","score":0.00439,"percentile":0.37873,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-hx8v-g79f-8w5f","url":"https://osv.dev/vulnerability/GHSA-hx8v-g79f-8w5f","summary":"LiteLLM Proxy has server-side request forgery via the `user_config` request parameter","modified":"2026-10-01T17:55:42.736980330Z","packages":[{"ecosystem":"PyPI","name":"litellm","purl":"pkg:pypi/litellm","ranges":["<1.83.9"],"fixed":["1.83.9"]}]},{"id":"PYSEC-2026-4070","url":"https://osv.dev/vulnerability/PYSEC-2026-4070","summary":"LiteLLM Proxy has server-side request forgery via the `user_config` request parameter","modified":"2026-10-01T17:45:05.570511919Z","packages":[{"ecosystem":"PyPI","name":"litellm","purl":"pkg:pypi/litellm","ranges":["<1.83.9"],"fixed":["1.83.9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}