Live › vulnerability › CVE-2026-59822
Go to dashboardLiteLLM's MCP Streamable HTTP endpoint (/mcp/) accepts a fabricated Bearer token. The OAuth2 passthrough fallback replaced failed LiteLLM key validation with an empty UserAPIKeyAuth(). An unauthenticated attacker can list and call configured MCP tools and reach the services behind them. Fixed in 1.84.0. CISA KEV lists it as exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| BerriAI LiteLLM | vendor | – | – |
| litellm | pypi | < 1.84.0 | 1.84.0 |
| litellm | vendor | < 1.84.0 | 1.84.0 |
pip show litellm or pip list | grep litellm on the host or container1.84.0 is affecteds /mcp/ path with a made-up Authorization: Bearer x' header should return 401/4031.84.0 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint that could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
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