CVE-2026-57584: CWE-1333: Inefficient Regular Expression Complexity in phalcon cphalcon
CVE-2026-57584 is a high-severity vulnerability in the Phalcon PHP framework prior to version 5.15.0. It involves inefficient regular expression complexity in the default router, where nested quantifiers in the compiled PCRE pattern can lead to catastrophic backtracking. This occurs when the router matches attacker-controlled request URIs containing crafted paths with repeated slashes and decoded newlines, potentially causing CPU exhaustion or route-matching failure. The issue is resolved in Phalcon version 5.15.0.
AI Analysis
Technical Summary
Phalcon MVC applications using the default router prior to version 5.15.0 register a built-in route with a compiled PCRE pattern containing nested quantifiers (/.), produced also by the /:params placeholder and CLI router. The Router::handle() method matches this pattern against the request URI on every request. An attacker can craft a URI with repeated slashes and decoded newlines to trigger catastrophic backtracking in the regex engine, leading to CPU exhaustion or failure in route matching. This vulnerability is identified as CWE-1333 (Inefficient Regular Expression Complexity) and has a CVSS 4.0 score of 8.7 (high severity). The issue is fixed in version 5.15.0.
Potential Impact
An attacker can cause denial of service by sending specially crafted request URIs that exploit the inefficient regular expression in the router, leading to excessive CPU consumption or failure to match routes properly. This can degrade application availability or cause service interruptions.
Mitigation Recommendations
Upgrade Phalcon to version 5.15.0 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory indicating the fix in 5.15.0. No other mitigation is specified or required.
CVE-2026-57584: CWE-1333: Inefficient Regular Expression Complexity in phalcon cphalcon
Description
CVE-2026-57584 is a high-severity vulnerability in the Phalcon PHP framework prior to version 5.15.0. It involves inefficient regular expression complexity in the default router, where nested quantifiers in the compiled PCRE pattern can lead to catastrophic backtracking. This occurs when the router matches attacker-controlled request URIs containing crafted paths with repeated slashes and decoded newlines, potentially causing CPU exhaustion or route-matching failure. The issue is resolved in Phalcon version 5.15.0.
CVSS v4.0
Score 8.7high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Phalcon MVC applications using the default router prior to version 5.15.0 register a built-in route with a compiled PCRE pattern containing nested quantifiers (/.), produced also by the /:params placeholder and CLI router. The Router::handle() method matches this pattern against the request URI on every request. An attacker can craft a URI with repeated slashes and decoded newlines to trigger catastrophic backtracking in the regex engine, leading to CPU exhaustion or failure in route matching. This vulnerability is identified as CWE-1333 (Inefficient Regular Expression Complexity) and has a CVSS 4.0 score of 8.7 (high severity). The issue is fixed in version 5.15.0.
Potential Impact
An attacker can cause denial of service by sending specially crafted request URIs that exploit the inefficient regular expression in the router, leading to excessive CPU consumption or failure to match routes properly. This can degrade application availability or cause service interruptions.
Mitigation Recommendations
Upgrade Phalcon to version 5.15.0 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory indicating the fix in 5.15.0. No other mitigation is specified or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-24T18:49:56.209Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a51650f68715ace433b3d1d
Added to database: 07/10/2026, 21:33:03 UTC
Last enriched: 07/10/2026, 21:47:25 UTC
Last updated: 07/10/2026, 22:27:32 UTC
Views: 7
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