← Vulnerability feed

Vulnerability record · CVE-2026-49468 · published 22 June 2026

CVE-2026-49468: Litellm authentication bypass by spoofing vulnerability

Litellm · Litellm

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.

9.5 CVSS 4.0 Critical EPSS 0.82% · top 44.6% CWE-290 · Authentication bypass by spoofing
9.5CVSS 4.0 base score
0.82%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
15 Jul 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/BerriAI/litellm/releases/tag/v1.84.0 ProductRelease Notes
https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w MitigationPatchVendor Advisory
https://access.redhat.com/security/cve/CVE-2026-49468
https://bugzilla.redhat.com/show_bug.cgi?id=2491520
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49468.json

Track CVE-2026-49468 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.4CVE-2026-33634Trivy and trivy-action supply chain compromise via malicious release and tagsA threat actor used compromised credentials to publish a malicious Trivy v0.69.4 release, force-push 76 of 77 version tags in aquasecurity/trivy-acti…KEVEPSS 1.7%analysed9.3CVE-2026-42208LiteLLM proxy SQL injection in API key checkLiteLLM versions 1.81.16 to before 1.83.7 build a database query for proxy API key checks by concatenating the caller-supplied key into the query tex…KEVEPSS 5.8%analysed8.8CVE-2026-59822LiteLLM MCP endpoint auth bypass via OAuth2 passthrough fallbackLiteLLM's MCP Streamable HTTP endpoint, prior to 1.84.0, let an unauthenticated attacker send a fabricated Authorization header that triggered an OAu…KEVEPSS 0.84%analysed8.7CVE-2026-42271LiteLLM MCP test endpoints allow authenticated OS command injectionLiteLLM versions 1.74.2 through before 1.83.7 expose two MCP preview endpoints (POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list) th…KEVEPSS 13%analysed9.8CVE-2024-5751Litellm code injection vulnerabilityBerriAI/litellm version v1.35.8 contains a vulnerability where an attacker can achieve remote code execution. The vulnerability exists in the `add_de…EPSS 0.88%9.8CVE-2024-2952Litellm vulnerabilityBerriAI/litellm is vulnerable to Server-Side Template Injection (SSTI) via the `/completions` endpoint. The vulnerability arises from the `hf_chat_te…EPSS 1.3%9.4CVE-2026-35030Litellm improper authentication vulnerabilityLiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, when JWT authentication is enabled (enable_jwt…EPSS 0.88%8.8CVE-2026-40217Litellm code injection vulnerabilityLiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the /guardrails/test_custom_code URI.EPSS 3.4%

Source: NIST National Vulnerability Database (record CVE-2026-49468), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.