{"id":"CVE-2026-59823","state":"PUBLISHED","title":"LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy","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.","publishedAt":"2026-09-16T18:36:21.105Z","updatedAt":"2026-09-17T15:07:47.837Z","severity":{"score":5.3,"label":"Medium","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["BerriAI litellm"],"affected":[{"vendor":"BerriAI","product":"litellm","versions":[{"version":"< 1.83.9","status":"affected"}]}],"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"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59823.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59823","state":"PUBLISHED","datePublished":"2026-09-16T18:36:21.105Z","dateUpdated":"2026-09-17T15:07:47.837Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-07T15:00:50.978Z"},"containers":{"cna":{"title":"LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"BerriAI","product":"litellm","versions":[{"version":"< 1.83.9","status":"affected"}]}],"references":[{"url":"https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f","name":"https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/BerriAI/litellm/pull/25827","name":"https://github.com/BerriAI/litellm/pull/25827","tags":["x_refsource_MISC"]},{"url":"https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427","name":"https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-16T18:36:21.105Z"},"source":{"advisory":"GHSA-hx8v-g79f-8w5f","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T15:07:39.533665Z","id":"CVE-2026-59823","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-17T15:07:47.837Z"}}]}}}