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CVE

CVE-2026-49468

LiteLLM: Authentication Bypass via Host Header Injection
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CVE

CVE-2026-49468

LiteLLM: Authentication Bypass via Host Header Injection

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/authutils.py::getrequest_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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.5
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
10
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/BerriAI/litellm/releases/tag/v1.84.0, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49468.json, https://access.redhat.com/security/cve/CVE-2026-49468, https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49468.json, https://nvd.nist.gov/vuln/detail/CVE-2026-49468, https://bugzilla.redhat.com/show_bug.cgi?id=2491520

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00592%
EPSS Percentile
0.46477%
Introduced Version
0
Fix Available
e1fc955464bf493c15aef08f98e0e22bdf24d4cf,2.11.2-r12,3.2.2-r7

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