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
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-SYMFONYROUTING-16799802
- published22 May 2026
- disclosed20 May 2026
- creditUnknown
Introduced: 20 May 2026
CVE-2026-45065 (opens in a new tab)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 '#^'.$req.'$#'.