CVE-2026-48806 PUBLISHED

Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys

Assigner: GitHub_M
Reserved: 22.05.2026 Published: 14.07.2026 Updated: 15.07.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	twigphp
Product	Twig
Versions	Version < 3.27.0 is affected

References

Problem Types

CWE-693: Protection Mechanism Failure CWE
CWE-863: Incorrect Authorization CWE