Improper Neutralization of Special Elements Used in a Template Engine Affecting php-twig package, versions <3.27.0-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-PHPTWIG-17089887
- published29 May 2026
- disclosed4 Sept 2026
Introduced: 29 May 2026
CVE-2026-46636 (opens in a new tab)How to fix?
Upgrade Debian:unstable php-twig to version 3.27.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream php-twig package and not the php-twig package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.
References
- https://security-tracker.debian.org/tracker/CVE-2026-46636
- http://github.com/twigphp/Twig/releases/tag/v3.27.0
- https://github.com/twigphp/Twig/security/advisories/GHSA-64jr-qjx4-w2fh
- https://security-tracker.debian.org/tracker/DSA-6311-1
- https://symfony.com/blog/cve-2026-46636-sandbox-filter-tag-and-function-allow-list-bypass-when-sandbox-state-changes-between-renders