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High severity8.2CISA KEVNVD Advisory· Published Jul 8, 2026· Updated Sep 3, 2026

CVE-2026-59822

CVE-2026-59822

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
litellmPyPI
< 1.84.01.84.0

Affected products

2
  • Berriai/Litellm2 versions
    cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*range: <1.84.0
    • (no CPE)range: <1.84.0

Patches

Vulnerability mechanics

References

8

News mentions

6