CVE-2026-59822

HighCVSS 8.2/10Known exploited (CISA KEV)Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 8.2/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Weakness enumeration

CWE-287 CWE-306

Affected software

Vendor	Product	Versions
BerriAI	litellm	< 1.84.0

References

https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2cPatch
https://github.com/BerriAI/litellm/pull/26463Issue Tracking, Patch
https://github.com/BerriAI/litellm/releases/tag/v1.84.0Product, Release Notes
https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95qMitigation, Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822US Government Resource
https://www.wiz.io/blog/ai-infrastructure-honeypotThird Party Advisory

Timeline

Published: Jul 8, 2026
Last modified: Oct 25, 2026
Added to CISA KEV: Sep 2, 2026
NVD status: Analyzed

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