CVE-2026-46640

Analyzed Analyzed - Analysis Complete

Remote Code Execution in Twig Template Engine

Publication date: 2026-07-14

Last updated on: 2026-07-16

Assigner: GitHub, Inc.

Description

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-14

Last Modified

2026-07-16

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-46640

Affected Vendors & Products

Vendor	Product	Version / Range
symfony	twig	From 3.15.0 (inc) to 3.26.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Attack-Flow Graph

Executive Summary

This vulnerability affects the Twig PHP template engine. Between versions 3.15.0 and 3.26.0, specific syntax could allow an attacker to inject malicious strings into template names. This bypasses validation and causes raw PHP code to be generated and executed when the template loads.

Detection Guidance

This vulnerability affects Twig versions between 3.15.0 and 3.26.0. To detect it, check your Twig version with: composer show twig/twig. If the version is within the affected range, update to 3.26.0 or later immediately.

Impact Analysis

An attacker could exploit this to execute arbitrary PHP code on your server when templates are loaded. This could lead to full system compromise, data theft, or unauthorized actions depending on the application's permissions.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations using vulnerable Twig versions may face compliance violations and legal penalties.

Mitigation Strategies

Upgrade Twig to version 3.26.0 or later to address the vulnerability. Review templates using _self. or import-alias syntax for unexpected PHP code execution.

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