CVE-2026-48784: Sensiolabs Symfony

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, UrlGenerator::doGenerate() used strtr() dot-segment encoding that skipped every other chained ../ or ./ segment, allowing attacker-controlled route parameters to generate URLs that collapse to a different path under RFC 3986 normalization. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.

Affected products

• Sensiolabs Symfony: before 5.4.53 (fixed in 5.4.53); from 6.0.0, before 6.4.41 (fixed in 6.4.41); from 7.0.0, before 7.4.13 (fixed in 7.4.13); from 8.0.0, before 8.0.13 (fixed in 8.0.13)

Published 2026-07-14. Last modified 2026-07-15.