Twig: Sandbox property allowlist bypass via the `column` filter (array_column on objects)
Date: 2026-05
Affected: composer/twig/twig
Attack vector: auth-bypass
Category: vulnerability-disclosure
Severity: Low
CVE: CVE-2026-46635
CWE: CWE-863

### Description The `column` filter passes its input straight to PHP's native `array_column()`. When the array elements are objects, `array_column()` reads `$obj->$name` (and `$obj->$index`) directly, including invoking `__get`/`__isset`. Because this property read happens entirely in PHP native code and never reaches `CoreExtension::getAttribute()`, `SandboxExtension::checkPropertyAllowed()` is never consulted. An untrusted template author with `column` in their `allowedFilters` list can therefore read any public or magic property of any object reachable in the render context, regardless of the `SecurityPolicy` `allowedProperties` list. This is a variant of CVE-2024-51755 / GHSA-jjxq-ff2g-95vh that the `ArrayAccess`-focused fix did not cover. ### Resolution The `column` filter now routes object property reads through the sandbox-aware attribute accessor so the property allowlist is enforced. ### Credits Twig: would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.


Mitigations:

Architectural layers (MAESTRO):