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CVE-2026-59823— LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy

Quick assessment

Affected
BerriAI litellm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 b

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
BerriAI litellm < 1.83.9 affected
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I. Basic Information for CVE-2026-59823

Vulnerability Information

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Vulnerability Title
LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
BerriAI litellm < 1.83.9 -

II. Public POCs for CVE-2026-59823

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III. Intelligence Information for CVE-2026-59823

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Patches & Fixes for CVE-2026-59823 (1)

Other References for CVE-2026-59823 (1)

IV. Related Vulnerabilities

Same product: litellm
Same vendor: BerriAI
Same weakness: CWE-918

V. Comments for CVE-2026-59823

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