What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-22 · updated 2026-10-25
• Weakness: CWE-290

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

• BerriAI litellm: before 1.84.0 — fixed in 1.84.0

How to fix

Upgrade to a fixed version: BerriAI litellm 1.84.0. Check the vendor advisory for mitigations.

References

• https://github.com/BerriAI/litellm/releases/tag/v1.84.0
• https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w
• https://access.redhat.com/security/cve/CVE-2026-49468
• https://bugzilla.redhat.com/show_bug.cgi?id=2491520
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49468.json

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