---
schema_version: '1.0'
id: security-20260711-af5d1c
url: https://osv.dev/vulnerability/GHSA-4xpc-pv4p-pm3w
url_hash: af5d1c1b6233df07783a76b9b56e48e49a2e9467e17a0a553079ce0a35817d67
canonical_url: https://osv.dev/vulnerability/GHSA-4xpc-pv4p-pm3w
source: osv:ghsa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-49468
- GHSA-4xpc-pv4p-pm3w
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- litellm
- PyPI
lang: en
published_at: '2026-06-16T23:38:26Z'
fetched_at: '2026-07-11T06:37:17Z'
updated_at: '2026-07-19T06:52:16Z'
status: published
content_hash: 6d62920b22d75f49499692a6a8d8fb64120c606141dc467f9f32920bf1482072
content_changed_at: '2026-07-19T06:51:51.835516Z'
license_note: full
summary: 'LiteLLM: Authentication Bypass via Host Header Injection'
summary_source: rss
summary_en: 'LiteLLM: Authentication Bypass via Host Header Injection'
entities:
- name: CVE
  type: concept
- name: Herme's Dashboard Basic Authentication User
  type: person
- name: Latvia
  type: location
related_auto:
- name: MCP_Python_SDK
  type: content
  weight: 2.0
- name: Herme's Dashboard Basic Authentication Password
  type: person
  weight: 2.0
- name: Europesays.com
  type: content
  weight: 1.0
- name: Lithuania
  type: location
  weight: 1.0
- name: food_additives
  type: data
  weight: 1.0
title: 'CVE-2026-49468: LiteLLM: Authentication Bypass via Host Header Injection'
---

# CVE-2026-49468: LiteLLM: Authentication Bypass via Host Header Injection

## TL;DR
LiteLLM: Authentication Bypass via Host Header Injection

## Key Points
- cve / CVE-2026-49468 / GHSA-4xpc-pv4p-pm3w / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H / litellm / PyPI

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
**Advisory:** GHSA-4xpc-pv4p-pm3w (CVE-2026-49468)

**Affected (your watchlist):**
- `PyPI:litellm` 1.72.6.post2 → fixed in 1.84.0 [docker/docker-strands]

**Details:**
### Impact

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.

**Most deployments are not affected.** The bypass is blocked by any upstream layer that validates or normalizes `Host`, such as:

- a CDN or WAF, such as Cloudflare
- a reverse proxy with `server_name` allowlists
- a host-based load balancer

**LiteLLM Cloud customers are not affected.**

### Patches

Fixed in **`1.84.0`**. Upgrade to `1.84.0` or later. No configuration change is required.

### Workarounds

If upgrading is not immediately possible, place the proxy behind an upstream component that validates or normalizes the `Host` header before forwarding (a CDN/WAF, a reverse proxy with explicit `server_name` allowlists, or a cloud load balancer with host-based routing rules), or otherwise restrict network access to the proxy listener.

### References

- Patched release: [`v1.84.0`](https://github.com/BerriAI/litellm/releases/tag/v1.84.0)

**Discovery Credit**: Le The Thang (KCSC) and Kim Ngoc Chung (One Mount Group)

**References:**
- https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w
- https://nvd.nist.gov/vuln/detail/CVE-2026-49468
- https://access.redhat.com/security/cve/CVE-2026-49468
- https://bugzilla.redhat.com/show_bug.cgi?id=2491520
- https://github.com/BerriAI/litellm
- https://github.com/BerriAI/litellm/releases/tag/v1.84.0
- https://github.com/advisories/GHSA-4xpc-pv4p-pm3w
- https://github.com/pypa/advisory-database/tree/main/vulns/litellm/PYSEC-2026-388.yaml
- https://pypi.org/project/litellm
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49468.json

_Data: OSV.dev (upstream: ghsa) — https://osv.dev/vulnerability/GHSA-4xpc-pv4p-pm3w_

## Source
元記事: [CVE-2026-49468: LiteLLM: Authentication Bypass via Host Header Injection](https://osv.dev/vulnerability/GHSA-4xpc-pv4p-pm3w) — published 2026-06-16T23:38:26Z