LiteLLM Flaw CVE-2026-42271 Exploited in the Wild, Chains to Unauthenticated RCE

CISA added a high-severity command injection flaw (CVE-2026-42271, CVSS 8.7) in BerriAI LiteLLM to its KEV catalog due to active exploitation. The vulnerability allows any authenticated user to execute arbitrary commands via the `/mcp-rest/test/connection` and `/mcp-rest/test/tools/list` endpoints. Security researchers chained it with a Starlette host header validation bypass (CVE-2026-48710, CVSS 6.5) to achieve unauthenticated remote code execution (combined CVSS 10.0). This chain enables attackers to run commands, steal API keys and secrets, move laterally, and compromise downstream systems. Users should update LiteLLM to version 1.83.7+ and Starlette to 1.0.1+, block the affected endpoints, restrict network access, rotate credentials, and review logs. 

https://thehackernews.com/2026/06/litellm-flaw-cve-2026-42271-exploited.html

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