What is 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.
The record classifies CVE-2026-49468 under weakness class CWE-290. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 128 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.1 — HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v4.0 base score
- 9.5
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H - EPSS (FIRST)
- 3.0% probability of exploitation in the next 30 days, higher than 87.1% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-06-22, last modified 2026-07-15
Is CVE-2026-49468 being exploited?
Weaponised exploit code for CVE-2026-49468 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2026/CVE-2026-49468.yaml). It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.
Affected products and versions
- BerriAI: litellm
Affected software packages:
pip:litellm— patched in 1.84.0
How to fix CVE-2026-49468
Fixed versions are recorded for 1 package: pip:litellm 1.84.0. No vendor patch reference has been recorded for CVE-2026-49468 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-49468
1 tracked threat in the Threadlinqs corpus references CVE-2026-49468, either in the campaign’s CVE list or as an indicator on the campaign record.
- LiteLLM Proxy Authentication Bypass via Host Header Injection (CVE-2026-49468) — CRITICAL · 2026-06-17
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on .