{"schemaVersion":3,"id":"CVE-2026-59822","aliases":["GHSA-7488-6r32-c95q","PYSEC-2026-3479"],"status":"published","duplicateOf":null,"title":"BerriAI LiteLLM Improper Authentication Vulnerability","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. 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mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. 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https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk"},{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2026-59822","label":"nvd.nist.gov/vuln/detail/CVE-2026-59822"}],"vendor":"BerriAI","product":"LiteLLM","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-287","name":"Improper Authentication","description":"When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/287.html"},{"id":"CWE-306","name":"Missing Authentication for Critical 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