HIGH7.3
GHSA-4jcj-7x88-m979
LiteLLM: MCP Proxy Has Improper Authentication
Quick fix
GHSA-4jcj-7x88-m979 — litellm: upgrade to the fixed version with the command below.
pip install --upgrade 'litellm>=1.84.0'Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-12773[ADVISORY]
- https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c[WEB]
- https://access.redhat.com/security/cve/CVE-2026-12773[WEB]
- https://bugzilla.redhat.com/show_bug.cgi?id=2491112[WEB]
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e[WEB]
- https://github.com/BerriAI/litellm[PACKAGE]
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json[WEB]
- https://vuldb.com/cve/CVE-2026-12773[WEB]
- https://vuldb.com/submit/811282[WEB]
- https://vuldb.com/vuln/372515[WEB]
- https://vuldb.com/vuln/372515/cti[WEB]