{
    "id": "CVE-2026-59822",
    "published": "2026-07-08 20:16:57",
    "last_modified": "2026-09-03 13:05:59",
    "cvss_score": "8.2",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
    "cwe": "CWE-287",
    "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.",
    "epss_score": "0.00836",
    "epss_percentile": "0.56030",
    "kev": 1,
    "kev_due": "2026-09-16",
    "has_exploit": 0,
    "updated_at": "2026-09-27 18:18:00",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-09-16."
    },
    "products": [
        {
            "vendor": "litellm",
            "product": "litellm"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2026-59822",
        "date_added": "2026-09-02",
        "due_date": "2026-09-16",
        "vendor": "BerriAI",
        "product": "LiteLLM",
        "name": "BerriAI LiteLLM Improper Authentication Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c",
        "https://github.com/BerriAI/litellm/pull/26463",
        "https://github.com/BerriAI/litellm/releases/tag/v1.84.0",
        "https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822",
        "https://www.wiz.io/blog/ai-infrastructure-honeypot"
    ]
}