CVE-2026-42203
Full vulnerability record from the local CVENow database.
Description
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.80.5 to before version 1.83.7, the POST /prompts/test endpoint accepted user-supplied prompt templates and rendered them without sandboxing. A crafted template could run arbitrary code inside the LiteLLM Proxy process. The endpoint only checks that the caller presents a valid proxy API key, so any authenticated user could reach it. Depending on how the proxy is deployed, this could expose secrets in the process environment (such as provider API keys or database credentials) and allow commands to be run on the host. This issue has been patched in version 1.83.7.
Severity
HIGH
CVSS score
8.6
(v4.0)
Vulnerability status
Modified
Source identifier
Published
2026-05-08 04:16:19.450000
Last modified
2026-10-26 20:10:00.160000
View original CVE JSON
{
"id": "CVE-2026-42203",
"sourceIdentifier": "[email protected]",
"published": "2026-05-08T04:16:19.450",
"lastModified": "2026-10-26T20:10:00.160",
"vulnStatus": "Modified",
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"value": "LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.80.5 to before version 1.83.7, the POST /prompts/test endpoint accepted user-supplied prompt templates and rendered them without sandboxing. A crafted template could run arbitrary code inside the LiteLLM Proxy process. The endpoint only checks that the caller presents a valid proxy API key, so any authenticated user could reach it. Depending on how the proxy is deployed, this could expose secrets in the process environment (such as provider API keys or database credentials) and allow commands to be run on the host. This issue has been patched in version 1.83.7."
},
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"value": "LiteLLM es un servidor proxy (Gateway de IA) para llamar a las API de LLM en formato OpenAI (o nativo). Desde la versión 1.80.5 hasta antes de la versión 1.83.7, el endpoint POST /prompts/test aceptaba plantillas de prompt proporcionadas por el usuario y las renderizaba sin sandboxing. Una plantilla manipulada podría ejecutar código arbitrario dentro del proceso del Proxy de LiteLLM. El endpoint solo verifica que el llamador presente una clave API de proxy válida, por lo que cualquier usuario autenticado podría alcanzarlo. Dependiendo de cómo se despliegue el proxy, esto podría exponer secretos en el entorno del proceso (como claves API de proveedor o credenciales de base de datos) y permitir que se ejecuten comandos en el host. Este problema ha sido parcheado en la versión 1.83.7."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
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"product": "litellm",
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"modifiedAttackVector": "NOT_DEFINED",
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