CVE-2026-48806 Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys
Attackers can bypass Twig sandbox restrictions by using dynamic mapping keys that trigger __toString() without proper validation, potentially exposing restricted functionality.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48806?
CVE-2026-48806 is a high-severity vulnerability in twigphp Twig, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Twig is a template language for PHP. Prior to 3.27.0, ArrayExpression does not guard dynamic mapping keys that are coerced to strings, allowing PHP to invoke __toString() on a Stringable object used as a mapping key without calling SandboxExtension::ensureToStringAllowed(). This issue is fixed in version 3.27.0.
Which versions are affected by CVE-2026-48806?
2 open source packages ship an affected version, including twig/twig. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
twig/twig Packagist | All versions | 3.27.0 |
twig/twig Packagist | All versions | 3.27.0 |
Products include Symfony Twig.
How do I fix CVE-2026-48806?
Upgrade twig/twig to 3.27.0 or later.
Is CVE-2026-48806 being exploited?
There is no known exploitation of CVE-2026-48806 in the wild and no public exploit code.
Other vulnerabilities in twigphp Twig
- CVE-2018-13818 Code injection in n/a
- CVE-2026-46633 Twig: PHP code injection via `{% use %}` template name
- CVE-2026-46640 Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation
- CVE-2026-24425 Twig 2.16.x & 3.9.0-3.25.x Sandbox Bypass via SourcePolicyInterface
- CVE-2024-45411 Twig has a possible sandbox bypass
Sources
Also known as CLSA-2026-1784682900, DEBIAN-CVE-2026-48806, GHSA-5v5v-ww74-355v, UBUNTU-CVE-2026-48806.