CVE-2026-48806

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

Published: Jul 14, 2026Updated: Jul 17, 2026 Sources: CVE List NVDCWE-693

9.1CRITICAL

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-693 CWE-863

Affected Products

twigphp

oss-projectaka twig

TwigLibrary

OSS Libraries / web-framework

symfony

oss-projectaka twig (related), symfony framework

twigLibrary

OSS Libraries / web-framework

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v

github.com

https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105

github.com

https://github.com/twigphp/Twig/releases/tag/v3.27.0

github.com

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