CVE-2026-55878: Symfony Ux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Symfony UX is a JavaScript ecosystem for Symfony. From 2.32.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux:install console command installs files from a recipe kit by copying paths listed in a copy-files map, and because Path::isRelative() accepts paths like ../../../etc, a crafted or compromised kit can write attacker-controlled content to arbitrary locations or read local files outside the recipe directory. This issue is fixed in versions 2.36.1 and 3.2.0.

Affected products

• Symfony Ux: from 2.32.0, before 2.36.1 (fixed in 2.36.1); from 3.0.0, before 3.2.0 (fixed in 3.2.0)

Published 2026-07-08. Last modified 2026-07-10.