Improper Encoding or Escaping of Output Affecting symfony/symfony package, versions <5.4.53>=6.0.0-BETA1, <6.4.41>=7.0.0-BETA1, <7.4.13>=8.0.0-BETA1, <8.0.13
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-SYMFONYSYMFONY-16895567
- published27 May 2026
- disclosed27 May 2026
- creditalexpott
Introduced: 27 May 2026
CVE-2026-48784 (opens in a new tab)How to fix?
Upgrade symfony/symfony to version 5.4.53, 6.4.41, 7.4.13, 8.0.13 or higher.
Overview
symfony/symfony is a PHP framework for web applications and a set of reusable PHP components.
Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the UrlGenerator due to incorrectly encoding chained dot-segments (../ or ./). The legacy implementation used a strtr function that skipped escaping adjacent occurrences. If a route accepted broad parameter requirements (like .+), an attacker could input chained ../ segments, causing the generated URL to contain unescaped dots. When processed by strict RFC 3986 consumers (such as HTTP clients, reverse proxies, or internal routers), the path collapses off the intended route, creating a round-trip route integrity issue.