CVE-2026-34742

high Red Hat
CVSS v3 Base Score
8.0
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Published: April 2, 2026 (41 days ago)
Last Modified: April 2, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in the Model Context Protocol (MCP) Go SDK. When an HTTP-based MCP server is run on localhost without authentication, a malicious website can exploit a DNS rebinding vulnerability. This allows the attacker to bypass same-origin policy restrictions and send requests to the local MCP server. Consequently, an attacker could invoke tools or access resources exposed by the MCP server on behalf of the user.

CWE

CWE-1188

Affected Products

Migration Toolkit for VirtualizationOpenShift LightspeedOpenShift ServerlessRed Hat OpenShift AI (RHOAI)Red Hat OpenShift Dev Spaces

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 github.com