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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 5.5 · litellmNVD modified 2026-10-25 23:10
Affected (CPE criteria) 1
cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*
References 9
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e Exploit, Third Party Advisory
- https://vuldb.com/cve/CVE-2026-12773 Third Party Advisory, VDB Entry
- https://vuldb.com/submit/811282 Exploit, Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/372515 Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/372515/cti Permissions Required, VDB Entry
- https://access.redhat.com/security/cve/CVE-2026-12773
- https://bugzilla.redhat.com/show_bug.cgi?id=2491112
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json
- https://vuldb.com/submit/811282 Exploit, Third Party Advisory, VDB Entry