CVE-2026-59822 Details
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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Exploit prediction scoring system (EPSS) score for CVE-2026-59822
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.24 Probability of exploitation activity being observed over the next 30 days (16th percentile)
CVSS score for CVE-2026-59822
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
8.2 High
Products affected by CVE-2026-59822
Litellm 1.81.13
Litellm 1.81.9
Litellm 1.82.0
Litellm 1.82.1
Litellm 1.82.6
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-59822 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 76 49.67%
CN 15 9.80%
DE 12 7.84%
SG 10 6.54%
IN 5 3.27%
GB 5 3.27%
RU 3 1.96%
NL 3 1.96%
JP 3 1.96%
VN 2 1.31%

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CVE-2026-59822 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 121 93.80%
Telecommunications 5 3.88%
Media/Entertainment 1 0.78%
Government/Politics 1 0.78%
Retail 1 0.78%

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