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Vulnerabilities CVE-2026-42203

CVE-2026-42203

High
Open
TLP:CLEAR

LiteLLM: Server-Side Template Injection in /prompts/test endpoint

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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.

Details

CVSS Score
8.6
EPSS Score
0.37%

30.2th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
May 8, 2026
Last Modified
May 9, 2026
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