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

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

https://gcdradar.vercel.app/incidents/cve-2026-49468-litellm-authentication-bypass-via-host-header · AIR-2026-0732 · closed 2026-06-16

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-06-16
- AI role: Attack on AI
- Products: LiteLLM
- CVE ids: CVE-2026-49468
- CVSS: 9.8

## Summary

A host-header parsing flaw in the LiteLLM proxy could allow unauthenticated access to protected management routes under specific conditions. No active exploitation has been confirmed.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-06-22: CVE-2026-49468: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. (https://nvd.nist.gov/vuln/detail/CVE-2026-49468)
- 2026-06-16: CVE-2026-49468: LiteLLM: Authentication Bypass via Host Header Injection (https://github.com/advisories/GHSA-4xpc-pv4p-pm3w)

## Sources

- 2026-06-16 GitHub Advisory Database: CVE-2026-49468: LiteLLM: Authentication Bypass via Host Header Injection https://github.com/advisories/GHSA-4xpc-pv4p-pm3w
- 2026-06-22 NVD: CVE-2026-49468: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. https://nvd.nist.gov/vuln/detail/CVE-2026-49468

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.