Unauthenticated Access Vulnerability in LiteLLM Proxy Server by BerriAI
CVE-2026-59822

8.8HIGH

Key Information:

Vendor: Berriai
Status: Litellm
Vendor: CVE Published:; 8 July 2026

Badges

👾 Exploit Exists🟡 Public PoC🦅 CISA Reported

What is CVE-2026-59822?

LiteLLM, developed by BerriAI, is a proxy server that facilitates the usage of LLM APIs in OpenAI format. In versions prior to 1.84.0, a security flaw existed where an unauthenticated attacker could exploit a specially crafted Authorization header. This vulnerability enabled the attacker to bypass key validation, allowing unauthorized access to MCP tooling without a valid LiteLLM key. This issue was resolved in version 1.84.0, and users are encouraged to upgrade to this version to mitigate potential security risks.

CISA has reported CVE-2026-59822

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-59822 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: 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.

Affected Version(s)

litellm < 1.84.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-59822
Created by HORKimhab