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CVE-2026-57134 is an authentication bypass vulnerability in the npm package praisonai affecting the exported MCPSecurity helper. When MCPSecurity is used to protect MCP HTTP transports, gateways, or similar endpoints, the implementation improperly accepts invalid Basic and OAuth credentials without performing effective validation. As a result, any non-empty Authorization header may be treated as sufficient for authentication when those modes are configured. The flaw affects access-control enforcement at the authentication layer rather than a specific memory-safety condition, and can expose protected tools, resources, workflows, and actions to unauthorized users.
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