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CVE-2026-59822

HIGH
8.8
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-59822
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-07-07 15:00 UTC
Published
2026-07-08 19:32 UTC
Last updated
2026-07-08 19:32 UTC
Primary CWE
CWE-287
CWE-287: Improper Authentication
Vendor / Product
BerriAI / litellm
Sources
cve.org  ·  NVD

Severity & Metrics

8.8 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products (1)
VendorProductPlatformVersions
BerriAI litellm — < 1.84.0
Weakness (CWE)
CWESourceDescription
CWE-287 cna CWE-287: Improper Authentication
CWE-306 cna CWE-306: Missing Authentication for Critical Function
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.8 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
References (4)
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