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Description

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.

PUBLISHED Reserved 2026-05-22 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Problem types

CWE-172: Encoding Error

CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

Product status

< 5.4.53
affected

>= 6.0.0-BETA1, < 6.4.41
affected

>= 7.0.0-BETA1, < 7.4.13
affected

>= 8.0.0-BETA1, < 8.0.13
affected

< 5.4.53
affected

>= 6.0.0-BETA1, < 6.4.41
affected

>= 7.0.0-BETA1, < 7.4.13
affected

>= 8.0.0-BETA1, < 8.0.13
affected

References

github.com/...ymfony/security/advisories/GHSA-h5x3-xfc9-m39h

github.com/...ommit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d

github.com/symfony/symfony/releases/tag/v5.4.53

github.com/symfony/symfony/releases/tag/v6.4.41

github.com/symfony/symfony/releases/tag/v7.4.13

cve.org (CVE-2026-48784)

nvd.nist.gov (CVE-2026-48784)

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