CVE-2026-57584
Phalcon router regex causes ReDoS via crafted URI, enabling remote CPU exhaustion.
Is CVE-2026-57584 being exploited?
Not confirmed. CVE-2026-57584 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.52% probability of exploitation in the next 30 days.
How severe is CVE-2026-57584?
CVE-2026-57584 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-57584?
Yes. A fix has been recorded for CVE-2026-57584. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57584 affect?
CVE-2026-57584 affects Phalcon PHP < 5.15.0, Applications using Phalcon MVC default router, CLI router in affected Phalcon versions, Web servers hosting Phalcon-based apps. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57584?
Upgrade Phalcon to 5.15.0+ and apply WAF/URI normalization to block malicious paths.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote denial-of-service: attacker-crafted request URIs trigger catastrophic backtracking in router PCRE causing CPU exhaustion and route failures.
Immediate action required
- affected< 5.15.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.