Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity regular-expression denial of service in cphalcon from phalcon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.5%top 54.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	phalcon/cphalcon	5.15.0	GHSA-x7rj-f32v-7jjg

Affected products (as reported)

Vendor	Product	Versions
phalcon	cphalcon	< 5.15.0

Weakness: CWE-1333 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

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