CVE-2026-48807 Twig: Sandbox `__toString()` policy bypass via `Traversable` in `join` and `replace` filters

Twig is a template language for PHP. Prior to 3.27.0, the sandbox toString checks do not fully cover Traversable values passed to join and replace filters or operands evaluated by the in and not in operators, allowing contained Stringable objects to be coerced to strings without consulting the...

Sandbox `__toString()` policy bypass via `Traversable` in `join`/`replace` and `in`/`not in` operators

More info at https://symfony.com/blog/cve-2026-48807-sandbox-tostring-policy-bypass-via-traversable-in-join-replace-and-in-not-in-operators...