LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59823
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:39 UTC · Revision 1
Source evidence
LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy
core-osv · Original sourcePublished 16 Sept 2026, 18:36 UTC
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.
osv:CVE-2026-59823
Complete source record
{
"id": "e15360bab42c2523f8693f4afb5bbe9bbb0f669b0822109b6277d1d576e644d6",
"url": "https://osv.dev/vulnerability/CVE-2026-59823",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy",
"summary": "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.",
"evidence": "osv:CVE-2026-59823",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-59823",
"aliases": [
"CVE-2026-59823",
"GHSA-hx8v-g79f-8w5f",
"PYSEC-2026-4070"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/berriai/litellm",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "850fe595ac54fa426bee70c367afdfe865f3b356"
},
{
"fixed": "47214be317f45a2d2ac08258362e0481411eb427"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.83.9"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "47214be317f45a2d2ac08258362e0481411eb427"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59823.json"
}
}
],
"modified": "2026-10-28T02:30:26.669512966Z",
"provider": "osv",
"references": [
"https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59823.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-59823",
"https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427",
"https://github.com/BerriAI/litellm/pull/25827"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59823.json"
}
},
"related_cves": [
{
"value": "CVE-2026-59823",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493398,
"published_at": "2026-09-16T18:36:21.105+00:00"
}