medium5.4
CVE-2026-46637
Twig: HTML-output filters in twig/* extras incorrectly declared `is_safe => ['all']`
Impact
Twig is a template language for PHP. Prior to 3.26.0, several filters in twig/markdown-extra and twig/cssinliner-extra are registered with is_safe => [all], causing Twig to treat plain text or HTML output as safe in HTML, JavaScript, CSS, URL, and other contexts where the output is not properly escaped. This issue is fixed in version 3.26.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | twig/markdown-extra | < 3.26.0 | 3.26.0 |
| composer | twig/cssinliner-extra | < 3.26.0 | 3.26.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Twig | before 3.26.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jv8m-2544-3pg3
- https://github.com/twigphp/Twig/security/advisories/GHSA-jv8m-2544-3pg3
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/cssinliner-extra/CVE-2026-46637.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/markdown-extra/CVE-2026-46637.yaml
- https://symfony.com/cve-2026-46637
- https://github.com/twigphp/Twig/commit/84982072c79a7417b0d158a401d91344f3658299
- https://github.com/twigphp/Twig/commit/e36489d3521ecbfc08bdcc61294302557035f14a
- https://github.com/twigphp/Twig/releases/tag/v3.26.0