Incorrect Regular Expression Affecting symfony/routing package, versions <5.4.52>=6.0.0-BETA1, <6.4.40>=7.4.0-BETA1, <7.4.12>=8.0.0-BETA1, <8.0.12
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Incorrect Regular Expression vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-PHP-SYMFONYROUTING-16799802
- published22 May 2026
- disclosed20 May 2026
- creditUnknown
Introduced: 20 May 2026
NewCVE-2026-45065 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade symfony/routing to version 5.4.52, 6.4.40, 7.4.12, 8.0.12 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Regular Expression in the route URL requirements when a requirement is set as an alternation (such as _locale: 'ar|bg|...|vi|...|zh_CN'). An attacker can bypass security redirect restrictions by suppling a URL that passes any but the first and the last alternatives since they are the only ones anchored by ^ and $ in UrlGenerator constructed pattern '#^'.$req.'$#'.