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 (`twig_check_arrow_in_sandbox()`, `twig_array_some()`, `twig_array_every()`) were not updated: - `twig_array_some()` and `twig_array_every()` 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. - `twig_check_arrow_in_sandbox()` 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 `twig_resolve_is_sandboxed()` (the same helper compiled templates use), and forward it to the corresponding `CoreExtension::*` method. `twig_check_arrow_in_sandbox()` no longer triggers a `TypeError`, and `twig_array_some()` / `twig_array_every()` 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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-48805US | critical9.1 | — | ||
Twig is a template language for PHP. Prior to 3.27.0, deprecated internal wrappers in src/Resources/core.php do not forward the current sandbox state to CoreExtension::checkArrow()… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48805.yamlWEB
- https://github.com/twigphp/TwigPACKAGE
- https://github.com/twigphp/Twig/releases/tag/v3.27.0WEB
- https://github.com/twigphp/Twig/security/advisories/GHSA-p42q-9prx-q5wqWEB
- https://symfony.com/blog/cve-2026-48805-sandbox-state-regression-in-deprecated-internal-wrappers-in-src-resources-core-phpWEB
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