CVE-2026-42271 Details.
LiteLLM - Command Injection
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To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one.
About CVE-2026-42271. What It Means.
A critical unauthenticated remote code execution vulnerability exists in LiteLLM due to improper input handling in the MCP stdio test endpoint. An attacker can send a specially crafted request to the `/mcp-rest/test/connection` endpoint with controlled parameters, resulting in arbitrary command execution on the server. When combined with an authentication bypass technique—such as the Starlette BadHost flaw (CVE-2026-48710)—an unauthenticated attacker can exploit the chain to…
Affected Product. What Is Hit.
- Vendor
- berriai
- Product
- Berriai LiteLLM
More CVEs In Berriai LiteLLM.
FAQ
Common Questions.
LiteLLM - Command Injection. A critical unauthenticated remote code execution vulnerability exists in LiteLLM due to improper input handling in the MCP stdio test endpoint. An attacker can send a specially crafted request to the `/mcp-rest/test/connection` endpoint with controlled parameters, resulting in arbitrary command execution on the server. When combined with an authentication bypass technique—such as the Starlette BadHost flaw (CVE-2026-48710)—an unauthenticated attacker can exploit the chain to…
No. To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one. The facts about CVE-2026-42271 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
Yes. CVE-2026-42271 is on the CISA Known Exploited Vulnerabilities list, which means attackers have used it against real targets.
Update Berriai LiteLLM to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-42271. Atlas does not run a check for it, so nothing here says whether a particular site is affected.