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TI-2026-10918 Aliases CVE-2026-12773GHSA-4jcj-7x88-m979

BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication

Priority HIGH 70CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-287.

Summary

A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01017 63rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Partial litellm (PyPI): 1.84.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
BerriAIlitellm1.59.0; 1.59.1; 1.59.2; 1.59.3; 1.59.4; 1.59.5; 1.59.6; 1.59.7; 1.59.8—No fix listedCNA
—litellm (PyPI)before 1.84.01.84.0Patch availableGHSA-4jcj-7x88-m979
  • litellm VendorBerriAI Affected 1.59.0; 1.59.1; 1.59.2; 1.59.3; 1.59.4; 1.59.5; 1.59.6; 1.59.7; 1.59.8 Fixed in — No fix listed CNA
  • litellm (PyPI) Vendor— Affected before 1.84.0 Fixed in 1.84.0 Patch available GHSA-4jcj-7x88-m979

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*before 1.59.9VulnerableBerriAI
  • cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:* Versions before 1.59.9 Vulnerable ·BerriAI

Remediation

  • Fix · GHSA-4jcj-7x88-m979 litellm (PyPI) Fixed in 1.84.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
Not affected: 2 products
  • Red Hat Ansible Automation Platform 2
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-12773
  2. 2026-10-03 Alias added: GHSA-4jcj-7x88-m979

References

Exploit 1

Advisory 1

Other 5

  • TI-2026-26015 Trivy ecosystem supply chain briefly compromised KEVCVSS 4.0CRITICAL 9.4
  • TI-2026-30529 LiteLLM: SQL injection in Proxy API key verification KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-30582 LiteLLM: Authenticated command execution via MCP stdio test endpoints KEVCVSS 4.0HIGH 8.7
  • TI-2026-42639 LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback KEVCVSS 4.0HIGH 8.8
  • TI-2024-05340 Remote Code Execution in BerriAI/litellm CVSS 3.1CRITICAL 9.8
  • TI-2024-02760 Server-Side Template Injection in BerriAI/litellm CVSS 3.0CRITICAL 9.8
See all 36 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences