CVE Watch3 sept 2026

CVE-2026-59822

BerriAI LiteLLM Improper Authentication Vulnerability

CVSS

8.2

Alto

EPSS

0.5%

p42

KEV

SÍ

2 sept 2026

Exploit Today

0-100

Publicado: 8 jul 2026 · Última mod.: 3 sept 2026 · CWE-287 · CWE-306

EPSS · 30d

0.2%EPSS · 30 días0.5%

2026-08-052026-09-02

Ficha del catálogo KEV

Producto

BerriAI / LiteLLM

Vulnerabilidad

BerriAI LiteLLM Improper Authentication Vulnerability

Añadido a KEV

2 sept 2026

Remediar antes de

16 sept 2026

Uso conocido en ransomware

Descripción resumida

BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint that could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token.

Acción requerida

Apply 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. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Notas

https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-59822

Descripción técnica

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.

Referencias oficiales

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