PT-2026-42594 · Packagist · Twig/Twig

Published

2026-05-21

·

Updated

2026-05-21

CVSS v4.0

1.3

Low

VectorAV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U

Description

The spaceless filter is registered with is safe => ['html'], which means Twig's autoescaper does not escape its output in an HTML context. As a result, applying spaceless to attacker-controlled input that contains markup emits the markup unescaped even when the developer never wrote |raw and autoescape is enabled.
Example:
{% set payload = '<script>alert()</script>' %}
{{ payload }}     {# escaped #}
{{ payload|spaceless }} {# not escaped #}
The filter is deprecated but still functional. With the deprecation, some downstream projects (e.g. Drupal modules) have duplicated the filter and inherited the same is safe flag.

Resolution

The spaceless filter no longer marks its output as safe. Documentation has been updated to warn that spaceless should not be applied to unsanitised user input.

Credits

Twig would like to thank Pierre Rudloff for reporting the issue.

Exploit

Fix

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-116

Related Identifiers

GHSA-4J38-F5CW-54H7

Affected Products

Twig/Twig