Vulnerability in Berriai Litellm
CVE-2026-49468
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002
Affected products
- Berriai Litellm — versions < 1.84.0
- Litellm
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w (Patch, Mitigation, Vendor Advisory)
- github.com/BerriAI/litellm/releases/tag/v1.84.0 (Product, Release Notes)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-49468?
- CVE-2026-49468 is a critical-severity vulnerability in Berriai Litellm, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-06-22.
- How severe is CVE-2026-49468?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-49468 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.