CVE-2026-49468
LiteLLM: Authentication Bypass via Host Header Injection
CRITICAL 9.5EPSS 3.0%
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management routes. The auth layer derived the effective route from request.url.path in litellm/proxy/auth/auth_utils.py::get_request_route(), which Starlette reconstructs from the Host header. A crafted Host could therefore make the auth gate evaluate a different route from the one FastAPI dispatched. This vulnerability is fixed in 1.84.0.
- Affected
- BerriAI · litellm
- CVSS v4.0 GITHUB
- 9.5 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v4.0 GitHub
- 9.5 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H - CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 CNA
- 8.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 3.03% chance of exploitation in the next 30 days, 87th percentile
- Nuclei
- critical · CWE-290
- Published
- 2026-06-22
- Updated
- 2026-07-15
Proof-of-concept exploits (2)
- josephbrito/LiteLLM-Unauthenticated-Command-Injection0★ · 2026-08-28
- BiiTts/CVE-2026-49468-LiteLLM-Auth-Bypass5★ · 2026-07-03
Nuclei templates (1)
Security advisories
- BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w
- advisories/GHSA-4xpc-pv4p-pm3w
- BerriAI/litellm/releases/tag/v1.84.0