CVE-2026-48784
Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, UrlGenerator::doGenerate() used strtr() dot-segment encoding that skipped every other chained ../ or ./ segment, allowing attacker-controlled route parameters to generate URLs that collapse to a different path under RFC 3986 normalization. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.
| CWE | CWE-172 CWE-601 |
| Vendor | symfony |
| Product | symfony |
| Published | Jul 14, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
symfony / symfony
< 5.4.53 >= 6.0.0-BETA1, < 6.4.41 >= 7.0.0-BETA1, < 7.4.13 >= 8.0.0-BETA1, < 8.0.13
symfony / routing
< 5.4.53 >= 6.0.0-BETA1, < 6.4.41 >= 7.0.0-BETA1, < 7.4.13 >= 8.0.0-BETA1, < 8.0.13
References
github.com: https://github.com/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h github.com: https://github.com/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d github.com: https://github.com/symfony/symfony/releases/tag/v5.4.53 github.com: https://github.com/symfony/symfony/releases/tag/v6.4.41 github.com: https://github.com/symfony/symfony/releases/tag/v7.4.13