CVE-2026-46634 Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name

Twig is a template language for PHP. From 3.9.0 until 3.26.0, templatefromstring compiles an inner template under a synthesized stringtemplate name that can fall outside a SourcePolicyInterface sandbox decision, allowing a sandboxed template that can call templatefromstring and include to render ...