# CVE-2026-49468: BerriAI LiteLLM authentication bypass via Host header injection

Source: https://junglewise.ai/threats/cve-2026-49468-berriai-litellm-authentication-bypass-via-host-header-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-22. Updated: 2026-06-22  
License: CC BY 4.0 with a link back

CVE-2026-49468 · Severity: critical · CVSS 4 · Published 2026-06-22

LiteLLM is a proxy server used to manage and unify access to various Artificial Intelligence (AI) models. A security flaw in how the software handles web requests could allow an unauthorized attacker to bypass security checks and access administrative management features. This could lead to full control over the AI gateway, potentially exposing sensitive API keys or disrupting AI services.

Technologies: [Berriai LiteLLM](https://junglewise.ai/threats/technologies/litellm), [litellm (PyPI)](https://junglewise.ai/threats/technologies/pypi-litellm). Vendors: [Berriai](https://junglewise.ai/threats/vendors/berriai), [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-49468 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49468 being exploited in the wild.

**How severe is CVE-2026-49468?** Critical severity, with a CVSS score of 4, published 22 June 2026.

**Which products and versions are affected?** Berriai LiteLLM < 1.84.0; litellm (PyPI) ECOSYSTEM:introduced=0,fixed=1.84.0.

**Is there a fix for CVE-2026-49468?** Yes. litellm (PyPI): upgrade to 1.84.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49468 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-49468?** Check whether you run Berriai LiteLLM or litellm (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- litellm (PyPI): upgrade to 1.84.0 or later

  ```sh
  pip install "litellm>=1.84.0"
  ```


## Technical details

An authentication bypass vulnerability exists in LiteLLM due to a Host-header parsing flaw in the `get_request_route()` function within `litellm/proxy/auth/auth_utils.py`. The authentication layer derives the effective route from `request.url.path`, which is reconstructed by the Starlette framework using the user-supplied Host header. By crafting a specific Host header, an attacker can cause the authentication gate to evaluate a different route than the one actually dispatched by FastAPI. This allows unauthenticated attackers to reach protected management endpoints. The vulnerability is mitigated if the proxy is deployed behind a WAF, CDN, or reverse proxy that validates or normalizes the Host header. The issue is fixed in version 1.84.0.

## Affected products

- BerriAI litellm < 1.84.0

## Identifiers

- CVE-2026-49468
- GHSA-4xpc-pv4p-pm3w
- PYSEC-2026-388

## Timeline

- 2026-05-14: patched: Version 1.84.0 released
- 2026-05-28: advisory: GitHub Security Advisory published
- 2026-06-22: disclosed: CVE published to NVD

## References

- [https://github.com/BerriAI/litellm/releases/tag/v1.84.0](https://github.com/BerriAI/litellm/releases/tag/v1.84.0)
- [https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w](https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w)

## Related threats

- [LiteLLM arbitrary local file read via vertex_ai_credentials](https://junglewise.ai/threats/litellm-internal-user-viewer-arbitrary-local-file-read-via-vertex-ai-649a7475)
- [LiteLLM reflected XSS in SSO debug callback endpoint](https://junglewise.ai/threats/litellm-vulnerable-to-reflected-xss-in-sso-debug-callback-38154651)
- [LiteLLM proxy authentication bypass via reused crypto context](https://junglewise.ai/threats/cve-2026-114612-litellm-is-a-proxy-server-ai-gateway-to-call-llm-apis-in-openai)
- [BerriAI LiteLLM improper authorization in secret resolution](https://junglewise.ai/threats/cve-2026-108575-a-vulnerability-has-been-found-in-berriai-litellm-up-to-1-94-0)
- [BerriAI LiteLLM authorization bypass in spend tracking](https://junglewise.ai/threats/cve-2026-108574-a-flaw-has-been-found-in-berriai-litellm-up-to-1-95-0-affected)