Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| BerriAI | litellm | 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 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | litellm | < 1.84.0 | 1.84.0 | GHSA-4jcj-7x88-m979 |
References
- VDB-372515 | BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication vdb-entry technical-description
- VDB-372515 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-12773 | CVE Analysis and Report third-party-advisory
- Submit #811282 | litellm <= 1.59.8 Improper Authentication (CWE-287) third-party-advisory
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e exploit