PT-2026-42591 · Packagist · Twig/Twig

Publicado 2026-05-21 · Atualizado 2026-05-21

OSV

CVSS v4.0

8.7

Alta

Vetor base

AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Description

The obj.(expr) dynamic-attribute syntax (added in 3.15.0 as the replacement for the deprecated attribute() function) lets the attribute be an arbitrary expression. When the receiver is self (or any {% import %} alias) and the parenthesised expression is a string literal, DotExpressionParser short-circuits to the macro-call path and concatenates the attacker-controlled string into a MacroReferenceExpression name with no identifier validation. MacroReferenceExpression::compile() then emits that name raw into the generated PHP source.

An attacker who can supply template source can inject arbitrary PHP into the compiled template and execute it at template-load time, before checkSecurity() is ever called. This is a complete bypass of SandboxExtension, including a globally-enabled sandbox with an empty SecurityPolicy allowlist.

Resolution

The parser now validates that the dynamic attribute resolves to a valid macro identifier before routing through MacroReferenceExpression, and the macro-reference compiler emits the name through a properly escaped path.

Credits

Twig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

Exploit

Correção

Code Injection

Enumeração de Fraquezas

CWE-94

Identificadores relacionados

GHSA-45VW-WH46-2VX8

Produtos afetados

Twig/Twig

Referências · 6

• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-46640.yaml · Exploit
• 🔥 https://github.com/vladko312/extras/blob/main/CVE-2026-46640.py · Exploit
• https://github.com/twigphp/Twig/security/advisories/GHSA-45vw-wh46-2vx8 · Nota
• https://github.com/twigphp/Twig · Nota
• https://symfony.com/cve-2026-46640 · Nota
• https://osv.dev/vulnerability/GHSA-45vw-wh46-2vx8 · Aviso do Fabricante