critical9.8
CVE-2026-46634
Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name
Impact
Twig is a template language for PHP. From 3.9.0 until 3.26.0, template_from_string() compiles an inner template under a synthesized __string_template__<hash> name that can fall outside a SourcePolicyInterface sandbox decision, allowing a sandboxed template that can call template_from_string and include to render an inner template without security policy enforcement. This issue is fixed in version 3.26.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | twig/twig | >= 3.9.0, < 3.26.0 | 3.26.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Twig | from 3.9.0 before 3.26.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-24x9-r6q4-q93w
- https://github.com/twigphp/Twig/security/advisories/GHSA-24x9-r6q4-q93w
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-46634.yaml
- https://symfony.com/cve-2026-46634
- https://github.com/twigphp/Twig/commit/1cde8f2b62463f85d47995fc25f8241cb409d915
- https://github.com/twigphp/Twig/releases/tag/v3.26.0