CVE-2026-57584 phalcon CVE debrief

Who should care

Users of the Phalcon PHP framework, particularly those who have not upgraded to version 5.15.0, should be aware of this vulnerability and take steps to mitigate it. Operators, platform administrators, vulnerability management teams, and security teams may be impacted by this vulnerability and should review their deployments.

Technical summary

The Phalcon MVC application's default router registers a built-in route with a compiled PCRE pattern containing a nested quantifier (/.). This pattern can be exploited by a crafted path, such as one containing repeated slashes followed by decoded newlines, to trigger catastrophic backtracking and cause CPU exhaustion or route-matching failure. The issue is fixed in version 5.15.0. Affected users should prioritize upgrading to the latest version.

Defensive priority

High

Recommended defensive actions

• Upgrade to Phalcon version 5.15.0 or later
• Implement input validation and sanitization for request URIs
• Monitor for suspicious traffic patterns
• Consider implementing a web application firewall (WAF) to detect and prevent attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-10T22:16:44.560Z and has not been modified since then. The NVD entry is currently 8.7 HIGH. This vulnerability affects Phalcon PHP framework versions prior to 5.15.0. Users should verify their deployments and plan for updates or mitigations. Evidence is limited to public sources and may not cover all affected systems.

Official resources