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CVE-2026-49468

LiteLLM: Authentication Bypass via Host Header Injection

Published: Jun 22, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-290
9.8CRITICAL
NVD MITRE
EPSS Score
0.6%
Top 55.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

Description

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.

In plain language

AI Low urgency

CVE-2026-49468 is an authentication bypass bug in BerriAI litellm that was fixed in 1.84.0; typical small businesses using it should update now, but there’s no clear evidence it’s being exploited in the wild.

What to do

  1. Check what version of BerriAI litellm you are running and confirm whether you are on 1.84.0 or later.
  2. Upgrade to LiteLLM/BerriAI litellm 1.84.0 (or later) as soon as practical.
  3. Ask your IT person to verify the service is not exposed more broadly than needed (restrict access to trusted networks/users).

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-290

Affected Products

BerriAI
commercialaka berriai/litellm, litellm
litellmSaaS
AI / ML / llm-serving-inference
litellm
oss-project
litellmMixed
AI / ML / llm-serving-inference

Exploitability

Workaround Available
Is your org exposed to CVE-2026-49468?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w
github.com
https://github.com/BerriAI/litellm/releases/tag/v1.84.0
github.com
https://access.redhat.com/security/cve/CVE-2026-49468
access.redhat.com
and 2 more references View all →
News mentions
2

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