---
title: "Important: #84420 - Properly escape reserved chars in YAML"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:important-84420"
source: "Changelog/9.2/Important-84420-ProperlyEscapeReservedCharsInYaml.rst"
typo3-version: "9.2"
typo3-major: 9
type: "important"
issue: 84420
forge: "https://forge.typo3.org/issues/84420"
tags: ["Backend", "Frontend", "ext:form", "ext:rte_ckeditor"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Important: #84420 - Properly escape reserved chars in YAML {#important-84420}

See [forge#84420](https://forge.typo3.org/issues/84420)

## Description {#description}

If dealing with YAML files in the TYPO3 system - for instance to configure forms
using the `form` extension or if configuring `ckeditor` \- integrators should properly
quote strings containing special characters like `@` or `%` to be upwards compatible
with the version 4 symfony YAML parser.

More information can be found in the [Symfony](http://symfony.com/doc/current/components/yaml/yaml_format.html#strings) docs.