CVE-2026-12773
criticalA weakness has been identified in BerriAI litellm up to 1.59.8.
Vendor / product: Litellm — litellm
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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-06-21 04:16
Modified: 2026-10-25 23:10
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
litellm / litellm <1.59.9
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e cna@vuldb.com
- https://vuldb.com/cve/CVE-2026-12773 cna@vuldb.com
- https://vuldb.com/submit/811282 cna@vuldb.com
- https://vuldb.com/vuln/372515 cna@vuldb.com
- https://vuldb.com/vuln/372515/cti cna@vuldb.com
- https://access.redhat.com/security/cve/CVE-2026-12773 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://bugzilla.redhat.com/show_bug.cgi?id=2491112 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://vuldb.com/submit/811282 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗