Twig: Possible sandbox bypass when using a source policy
Description
When using the sandbox with a SourcePolicyInterface, Twig does not always apply the sandbox restriction that forbids non-Closure callbacks for callback-accepting filters.
The issue affects the sort, filter, map, and reduce filters.
In the affected versions, the runtime check that rejects non-Closure callbacks in sandbox mode does not use the current template Source. As a result, when the sandbox is enabled through a source policy instead of being enabled globally, Twig can incorrectly treat the current execution as non-sandboxed for these callback checks.
This can allow user-controlled templates to pass arbitrary PHP callables to callback-accepting filters even though the template is being sandboxed through a source policy.
The issue happens when all these conditions are met:
- The sandbox is not enabled globally;
- A
SourcePolicyInterfaceenables the sandbox for the rendered template; - The template uses one of the
sort,filter,map, orreducefilters; - The callback is not a
Closure.
Resolution
The patch makes callback sandbox checks source-aware by propagating the current template Source to callback-accepting filters and using it when deciding whether sandbox restrictions apply.
Credits
We would like to thank XavLim and Wade Sparks for reporting the issue and Fabien Potencier for fixing the issue.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | twig/twig | >= 2.16.0, <= 2.16.1, >= 3.9.0, < 3.26.0 | 3.26.0 |
Referencias
- https://github.com/twigphp/Twig/security/advisories/GHSA-2q52-x2ff-qgfr
- https://nvd.nist.gov/vuln/detail/CVE-2026-24425
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-24425.yaml
- https://github.com/twigphp/Twig
- https://github.com/twigphp/Twig/releases/tag/v3.26.0
- https://symfony.com/cve-2026-24425
- https://www.vulncheck.com/advisories/twig-x-x-sandbox-bypass-via-sourcepolicyinterface
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-693- Plataforma
- Composer
- Paquete
twig/twig- Publicada
- 05.06.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-2q52-x2ff-qgfr - CC BY 4.0
Historial de vulnerabilidades: twig/twig
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 24
- Primera → última
- 02.2022 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 8
- Media 8
- Baja 7
Divulgaciones por año
- 2022: 4
- 2023: 0
- 2024: 4
- 2025: 1
- 2026: 15
-
Twig: Possible sandbox bypass when using a source policy esta entrada
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