CVE-2018-19789: Debian Linux

Medium severity, CVSS 5.3. EPSS: 3.6% chance of exploitation in the next 30 days.

An issue was discovered in Symfony 2.7.x before 2.7.50, 2.8.x before 2.8.49, 3.x before 3.4.20, 4.0.x before 4.0.15, 4.1.x before 4.1.9, and 4.2.x before 4.2.1. When using the scalar type hint `string` in a setter method (e.g. `setName(string $name)`) of a class that's the `data_class` of a form, and when a file upload is submitted to the corresponding field instead of a normal text input, then `UploadedFile::__toString()` is called which will then return and disclose the path of the uploaded file. If combined with a local file inclusion issue in certain circumstances this could escalate it to a Remote Code Execution.

Affected products

• Debian Debian Linux: version 8.0 only
• Sensiolabs Symfony: from 2.7.0, before 2.7.50 (fixed in 2.7.50); from 2.8.0, before 2.8.49 (fixed in 2.8.49); from 3.0.0, before 3.4.20 (fixed in 3.4.20); from 4.0.0, before 4.0.15 (fixed in 4.0.15); from 4.1.0, before 4.1.9 (fixed in 4.1.9); from 4.2.0, before 4.2.1 (fixed in 4.2.1)

Published 2018-12-18. Last modified 2026-06-17.