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Critical · 9.5 Scanner template Public exploit CVE-2026-49468 EUVD-2026-38361GHSA-4xpc-pv4p-pm3wPYSEC-2026-388

LiteLLM: Authentication Bypass via Host Header Injection

Published Jun 22, 2026 · Updated Jul 15, 2026 · Assigned by GitHub_M

Vendor: BerriAI Product: litellm Package: airflow-3 Package: litellm Ecosystem: PyPI Ecosystem: Wolfi

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.

Affected products

VendorProductAffectedFixed
BerriAI litellm < 1.84.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling airflow-3 3.2.2-r7 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI litellm < 1.84.0 1.84.0 GHSA-4xpc-pv4p-pm3w

Advisories 1

References