CVE-2026-46636
Twig: Sandbox method allowlist bypass via `Markup` subclass
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 4, 2026
- Updated
- Sep 8, 2026
- Reserved
- May 15, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
Affected Products
| Product | Versions |
|---|---|
Twigtwigphp |
|
References
- https://github.com/twigphp/Twig/security/advisories/GHSA-64jr-qjx4-w2fh
- https://security-tracker.debian.org/tracker/CVE-2026-46636
- 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
- http://github.com/twigphp/Twig/releases/tag/v3.27.0
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