- Description
- 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.
- Source
- security-advisories@github.com
- NVD status
- Modified
- Products
- litellm
CVSS 4.0
- Type
- Secondary
- Base score
- 9.5
- Impact score
- -
- Exploitability score
- -
- Vector string
- 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
- Severity
- CRITICAL
CVSS 3.1
- Type
- Primary
- Base score
- 9.8
- Impact score
- 5.9
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- CRITICAL
- Hype score
- Not currently trending
šØ CVE-2026-49468 - critical šØ LiteLLM Proxy < 1.84.0 - Host Header Authentication Bypass > LiteLLM Proxy before 1.84.0 derives its public-route authorization check from a URL r... š¾ https://t.co/Ll334FFbAQ @pdnuclei #NucleiTemplates #cve
@pdnuclei_bot
2 Oct 2026
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LiteLLM CVE-2026-49468: a crafted Host header desyncs the auth route from the route FastAPI actually runs. Pre-auth bypass ā no creds, no clicks ā on the gateway sitting under CrewAI, DSPy & GraphRAG. Patch to 1.84.0. #LLMSecurity #CVE https://t.co/YCwT2o2ED0
@llmhacking
18 Jun 2026
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[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*",
"matchCriteriaId": "0432AF82-95FD-4358-9414-7B41889CEFD2",
"versionEndExcluding": "1.84.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
]