CVE-2026-46634: Symfony Twig

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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 products

• Symfony Twig: from 3.9.0, before 3.26.0 (fixed in 3.26.0)

Published 2026-07-14. Last modified 2026-07-29.