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LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy

CVSS 4.0 5.3 MEDIUMCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-59823

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-59823

Published

litellm

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "BerriAI",
                    "product": "litellm",
                    "versions": [
                        {
                            "version": "< 1.83.9",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 13 Nov 08:15 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current