Authentication bypass in LiteLLM proxy via Host header injection
CVE-2026-49468 is a critical authentication bypass vulnerability in the LiteLLM proxy affecting versions prior to 1.84.0. The flaw is caused by improper handling of the HTTP Host header during route determination in the authentication layer. Specifically, the vulnerable logic is in get_request_route() within litellm/proxy/auth/auth_utils.py, where the authentication check derives the effective route from request.url.path. Because Starlette reconstructs request.url.path using the supplied Host header, a crafted Host header can cause the authentication layer to evaluate a different route than the one FastAPI ultimately dispatches. Under these conditions, an unauthenticated attacker can reach protected management routes that should require authentication.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical authentication bypass vulnerability in LiteLLM caused by Host header injection, allowing unauthenticated attackers to reach protected management routes under affected deployment conditions.
A critical authentication bypass vulnerability in LiteLLM caused by improper Host header handling, allowing route confusion between authentication checks and FastAPI processing and enabling unauthorized access to sensitive management endpoints.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.