high7.3
CVE-2026-12773
A weakness has been identified in BerriAI litellm up to 1.59.8.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | litellm | < 1.84.0 | 1.84.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Litellm | Litellm | before 1.59.9 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4jcj-7x88-m979
- https://nvd.nist.gov/vuln/detail/CVE-2026-12773
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e
- https://vuldb.com/cve/CVE-2026-12773
- https://vuldb.com/submit/811282
- https://vuldb.com/vuln/372515
- https://vuldb.com/vuln/372515/cti
- 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://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c