GHSA-4jcj-7x88-m979
LiteLLM: MCP Proxy Has Improper Authentication
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-12773
- https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c
- https://access.redhat.com/security/cve/CVE-2026-12773
- https://bugzilla.redhat.com/show_bug.cgi?id=2491112
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e
- https://github.com/BerriAI/litellm
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json
- https://vuldb.com/cve/CVE-2026-12773
- https://vuldb.com/submit/811282
- https://vuldb.com/vuln/372515
- https://vuldb.com/vuln/372515/cti