critical9.1
CVE-2026-48806
Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | twig/twig | <= 3.26.0 | 3.27.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Twig | before 3.27.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5v5v-ww74-355v
- https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48806.yaml
- https://github.com/twigphp/Twig/releases/tag/v3.27.0
- https://symfony.com/blog/cve-2026-48806-sandbox-tostring-policy-bypass-via-dynamic-mapping-keys
- https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105