CVE-2026-64684

A flaw was found in the rmcp component. This vulnerability allows a remote attacker to disclose sensitive information. When the rmcp crate's HTTP client processes a redirect to a different web address (cross-origin redirect) from a malicious or compromised Model Context Protocol (MCP) endpoint, it can inadvertently replay custom HTTP headers, such as API keys or authentication tokens, to the new, untrusted destination. This enables an attacker to capture and potentially reuse these sensitive credentials.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.