CVE-2026-59823
Severity not reportedLiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format.
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 products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427 security-advisories@github.com
- https://github.com/BerriAI/litellm/pull/25827 security-advisories@github.com
- https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f security-advisories@github.com