CVE-2026-57584: Phalcon Cphalcon

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

Phalcon is a high-performance, full-stack PHP framework. Prior to 5.15.0, every Phalcon MVC application built with a default router registers a built-in route whose compiled PCRE pattern contains the nested quantifier (/.), and the same construct is produced by the /:params placeholder and the CLI router. Phalcon\Mvc\Router::handle() matches this pattern against the attacker-controlled request URI on every request, so a crafted path such as one containing repeated slashes followed by decoded newlines can trigger catastrophic backtracking and cause CPU exhaustion or route-matching failure. This issue is fixed in version 5.15.0.

Affected products

• Phalcon Cphalcon: before 5.15.0 (fixed in 5.15.0)

Published 2026-07-10. Last modified 2026-07-13.