BerriAI LiteLLM up to 1.88.5/1.96.1 Request Validation auth_utils.py server-side request forgery

Summaryinfo

A vulnerability described as problematic has been identified in BerriAI LiteLLM up to 1.88.5/1.96.1. This issue affects some unknown processing of the file litellm/proxy/auth/auth_utils.py of the component Request Validation. Such manipulation of the argument api_base/base_url/model_list/fallbacks/litellm_credential_name leads to server-side request forgery. This vulnerability is referenced as CVE-2026-84377. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in BerriAI LiteLLM up to 1.88.5/1.96.1. Affected by this issue is an unknown code block of the file litellm/proxy/auth/auth_utils.py of the component Request Validation. The manipulation of the argument api_base/base_url/model_list/fallbacks/litellm_credential_name with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. CVE summarizes:

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to versions 1.88.6 and 1.96.2, any authenticated LiteLLM proxy user could redirect an outbound provider call to a destination the user controls and cause the proxy to send its configured provider credentials to that destination. Request validation in litellm/proxy/auth/auth_utils.py, litellm/proxy/common_request_processing.py, litellm/proxy/health_endpoints/_health_endpoints.py, litellm/proxy/image_endpoints/endpoints.py, and litellm/proxy/litellm_pre_call_utils.py used incomplete checks that did not cover every sensitive parameter or inspect equivalent values across nested request fields, path values, and bracket-notation form data. Routing and credential parameters including api_base, base_url, model_list, fallbacks, and litellm_credential_name could therefore be applied without clearing the operator's stored key, exposing upstream provider credentials and other configured secrets and permitting server-side requests to internal services reachable by the proxy. This issue is fixed in versions 1.88.6 and 1.96.2.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-84377 since 09/01/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

Upgrading to version 1.88.6 or 1.96.2 eliminates this vulnerability.

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Productinfo

Vendor

• BerriAI

Name

• LiteLLM

Version

• 1.88.0
• 1.88.1
• 1.88.2
• 1.88.3
• 1.88.4
• 1.88.5
• 1.96.0
• 1.96.1

Website

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

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