CVE-2026-48805: Twig: Sandbox state regression in deprecated internal wrappers in `src/Resources/core.php`

Description

The 3.26.0 source-policy hardening changed the signature of CoreExtension::checkArrow() to take a boolean $isSandboxed instead of an Environment, and added the same $isSandboxed argument to CoreExtension::arraySome() and CoreExtension::arrayEvery(). Compiled templates were updated to pass the per-source sandbox state computed at the call site.

The deprecated internal wrappers exposed in src/Resources/core.php for legacy third-party code (twigcheckarrowinsandbox(), twigarraysome(), twigarrayevery()) were not updated:

- twigarraysome() and twigarrayevery() call CoreExtension::arraySome() / arrayEvery() without forwarding the sandbox state. The underlying methods default $isSandboxed to false, so the callable-must-be-a-Closure restriction is silently bypassed in sandbox mode and a string callable such as 'strcmp' is accepted. - twigcheckarrowinsandbox() passes the Environment object where CoreExtension::checkArrow() now expects a bool, which throws a TypeError on PHP 8+.

Compiled Twig templates are not affected: they call CoreExtension:: directly with the correct arguments. Applications are only impacted if they still call the deprecated twig helpers on top of a sandboxed Environment.

Resolution

The three wrappers now resolve the current sandbox state via twigresolveissandboxed() (the same helper compiled templates use), and forward it to the corresponding CoreExtension:: method. twigcheckarrowinsandbox() no longer triggers a TypeError, and twigarraysome() / twigarrayevery() now enforce the same sandbox restriction as compiled templates.

Credits

We would like to thank El Kharoubi Iosif for reporting the issue and Fabien Potencier for providing the fix.