CVE-2026-9658 Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths

Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths. The header injection rule was ineffective at blocking header injections in the request paths unless they were double-encoded, for example, GET /path\r\nHTTP/1.1\r\nHost:...