SB2026052936 - Multiple vulnerabilities in LiteLLM

Description

This security bulletin contains information about 2 vulnerabilities.

1) Authentication Bypass by Spoofing (CVE-ID: CVE-2026-49468)

CWE-ID: CWE-290 - Authentication Bypass by Spoofing

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the host-header parsing flaw in the LiteLLM proxy. A remote attacker can gain access to protected management routes.

2) Improper access control (CVE-ID: N/A)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to access connected services exposed through MCP.

The vulnerability exists due to improper access control in the MCP Streamable HTTP endpoint when handling requests with a fabricated Authorization header during OAuth2 passthrough fallback. A remote attacker can send a request with an arbitrary bearer token to access connected services exposed through MCP.

This issue can allow listing and calling configured MCP tools.

Remediation

Install update from vendor's website.

References

• https://github.com/BerriAI/litellm/security/advisories/GHSA-4xpc-pv4p-pm3w
• https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q
• https://github.com/BerriAI/litellm/releases/tag/v1.84.0