CVE-2026-59822

LiteLLM

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.

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

Weakness

• CWE-287 Improper authentication
• CWE-306 Missing authentication

References

• github.comPatch
• github.comIssue TrackingPatch
• github.comRelease Notes
• github.comPatchVendor Advisory
• cisa.gov
• wiz.ioThird Party Advisory

CVE-2026-59822 on NVD

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