Bug 2498199 (CVE-2026-59822) - CVE-2026-59822 litellm: LiteLLM: Unauthorized access due to authentication bypass
Summary: CVE-2026-59822 litellm: LiteLLM: Unauthorized access due to authentication by...
Keywords:
Status: NEW
Alias: CVE-2026-59822
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 20:01 UTC by OSIDB Bzimport
Modified: 2026-09-02 20:46 UTC (History)
18 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-08 20:01:52 UTC 
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.
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