Description
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-59822 ↗
- github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c ↗
- github.com/BerriAI/litellm/pull/26463 ↗
- github.com/BerriAI/litellm/releases/tag/v1.84.0 ↗
- github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q ↗
- www.cisa.gov/known-exploited-vulnerabilities-catalog ↗
- www.wiz.io/blog/ai-infrastructure-honeypot ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.