CVE-2026-59822 Security Details

CVE ID

CVE-2026-59822

CWE

CWE-287

CWE-306

CVE 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.

Published

Jul 16, 2026

CVSS Score & Severity

8.2High

CVSS Vector

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

EPSS Score

0.870%

Malware

malware

KEV Status

Known Exploited

Affected Ecosystems

affected

Source

National Vulnerability Database

References

GitHub · BerriAI/litellmPROJECT