CVE-2026-59822

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c	Patch
https://github.com/BerriAI/litellm/pull/26463	Issue Tracking Patch
https://github.com/BerriAI/litellm/releases/tag/v1.84.0	Product Release Notes
https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q	Mitigation Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822	US Government Resource
https://www.wiz.io/blog/ai-infrastructure-honeypot	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) LiteLLM es un servidor proxy (AI Gateway) para llamar a las API de LLM en formato OpenAI (o nativo). Antes de la versión 1.84.0, el endpoint HTTP MCP Streamable de LiteLLM permitía a un atacante no autenticado utilizar un encabezado de autorización falsificado para activar una ruta de respaldo de paso de OAuth2 que reemplazaba la validación fallida de la clave de LiteLLM con un objeto UserAPIKeyAuth() vacío, permitiendo que las solicitudes llegaran a las herramientas de MCP sin una clave de LiteLLM válida. Este problema está solucionado en la versión 1.84.0.

Information

Published : 2026-07-08 20:16

Updated : 2026-10-25 17:10

NVD link : CVE-2026-59822

Mitre link : CVE-2026-59822

CVE.ORG link : CVE-2026-59822

JSON object : View

Products Affected

litellm

litellm

CWE

CWE-287

Improper Authentication

CWE-306

Missing Authentication for Critical Function

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