What’s Vulnerable › Vulnerabilities

CVE-2026-57584: Phalcon: Catastrophic backtracking (ReDoS) in the default Phalcon Router route lead to remote unauthenticated DoS

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-1333

Description

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

References

• https://github.com/phalcon/cphalcon/commit/14ba22d389d5ca620bb9d5207205f836ef1224f2
• https://github.com/phalcon/cphalcon/commit/fa798e919cb2c487062bb9899ad6fc2b673b3a67
• https://github.com/phalcon/cphalcon/releases/tag/v5.15.0
• https://github.com/phalcon/cphalcon/security/advisories/GHSA-x7rj-f32v-7jjg
• https://github.com/phalcon/cphalcon/security/advisories/GHSA-x7rj-f32v-7jjg

Get alerted when CVE-2026-57584 or the next vulnerability affects your stack