BerriAI LiteLLM up to 1.83.8 Request Body Validator user_config server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, was found in BerriAI LiteLLM up to 1.83.8. The impacted element is an unknown function of the component Request Body Validator. Executing a manipulation of the argument user_config can lead to server-side request forgery. This vulnerability is tracked as CVE-2026-59823. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in BerriAI LiteLLM up to 1.83.8. This vulnerability affects some unknown functionality of the component Request Body Validator. The manipulation of the argument user_config with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-59823 since 07/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available.

Upgrading to version 1.83.9 eliminates this vulnerability.

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Productinfo

Vendor

• BerriAI

Name

• LiteLLM

Version

• 1.83.0
• 1.83.1
• 1.83.2
• 1.83.3
• 1.83.4
• 1.83.5
• 1.83.6
• 1.83.7
• 1.83.8

Website

• Product: https://github.com/BerriAI/litellm/

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