EUVD-2026-80986Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable authed abuse of a valid virtual key (PR:L); SSRF crosses into internal systems (S:C) with blind low-confidentiality endpoint exposure only, no integrity or availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Server-side request forgery in LiteLLM Proxy versions prior to 1.83.9 lets an authenticated caller holding a valid virtual key redirect the gateway's outbound LLM traffic to an internal or external host of their choosing by placing api_base (or base_url) inside the user_config object of the request body instead of at the top level. Because is_request_body_safe in pre-1.83.9 only banned those keys at the top level and never inspected user_config, and because user_config feeds outbound router construction, the nested destination survives the safety check and reaches endpoints the caller could not otherwise access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated caller holding a valid LiteLLM virtual key (PR:L) against a LiteLLM Proxy earlier than 1.83.9. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but modest-severity SSRF (CWE-918). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: LiteLLM 1.83.9, which adds user_config to the banned_params list in is_request_body_safe so nested api_base/base_url overrides are rejected; upgrade to 1.83.9 or later per advisory GHSA-hx8v-g79f-8w5f (https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f), with the code change visible in PR https://github.com/BerriAI/litellm/pull/25827 and commit https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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