CVE-2026-59822

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products we track (1)

Recommendation

This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.

Official patch: https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c ↗

Additional information

• NVD record
• https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2cPatch
• https://github.com/BerriAI/litellm/pull/26463Patch
• https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95qPatch
• https://github.com/BerriAI/litellm/releases/tag/v1.84.0
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822
• https://www.wiz.io/blog/ai-infrastructure-honeypotAdvisory