RCE in Symfony Twig
CVE-2026-46640
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.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.006 (47.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Symfony Twig
- Twigphp Twig — versions >= 3.15.0, < 3.26.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-46640?
- CVE-2026-46640 is a high-severity vulnerability in Symfony Twig, classified under Code Injection. CVSS score: 8.8/10. Published 2026-07-14.
- How severe is CVE-2026-46640?
- High severity. CVSS v3 base score is 8.8 out of 10.