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EUVD-2026-337878

fkie_cve-2026-46639

Twig is a template language for PHP. From 3.24.0 until 3.26.0, object-destructuring assignment compiles CoreExtension::getAttribute() with the sandbox argument hardcoded to false, disabling property and method policy checks and allowing an attacker with write access to a sandboxed Twig template to read public properties or invoke public getters on objects passed to the template engine. This issue is fixed in version 3.26.0.

GHSA-mm6w-gr99-p3jj — Twig: Sandbox property and method bypass via object-destructuring assignment

Affected: Packagist: twig/twig

### Description

The object-destructuring assignment syntax introduced in Twig 3.24.0 generates a call to `CoreExtension::getAttribute()` with the `$sandboxed` argument hardcoded to `false`, regardless of whether a `SandboxExtension` is active. This permanently disables the sandbox's property and method policy checks for every destructuring expression.

`ObjectDestructuringSetBinary::compile()` emits:

```php CoreExtension::getAttribute($this->env, $this->source, ..., \Twig\Template::ANY_CALL, false, false, false, ...); // ^^^^^ // sandbox check never runs ```

Whereas `GetAttrExpression::compile()` correctly passes `$env->hasExtension(SandboxExtension::class)`.

An attacker with write access to a sandboxed Twig template can read any public property or invoke any public getter on objects passed to the template engine, bypassing `SecurityPolicy` restrictions. The exploit requires only the `{% do %}` tag to be in `allowedTags`, which is a common configuration.

### Resolution

The destructuring compiler now forwards the active sandbox flag to `getAttribute()` so property/method allowlists are enforced.

### Credits

Twig would like to thank Anvil Secure in collaboration with Claude and Anthropic Research for reporting and fixing the issue.

UBUNTU-CVE-2026-46639

Affected: Ubuntu:Pro:20.04:LTS: php-twig, Ubuntu:Pro:22.04:LTS: php-twig, Ubuntu:Pro:24.04:LTS: php-twig, Ubuntu:25.10: php-twig, Ubuntu:Pro:26.04:LTS: php-twig