CVE-2026-42203

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.

• CWE-1336
• CWE-94

• https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stableProduct, Release Notes
• https://github.com/BerriAI/litellm/security/advisories/GHSA-xqmj-j6mv-4862Mitigation, Patch, Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2026-42203
• https://bugzilla.redhat.com/show_bug.cgi?id=2467917
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42203.json

Published

May 8, 2026

Last Modified

Jul 15, 2026

Status

Modified

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