CVE-2026-25479 Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns

Litestar is an Asynchronous Server Gateway Interface ASGI framework. Prior to 2.20.0, in litestar.middleware.allowedhosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special meaning e.g., . matches any character. This enables a bypass...