CVE-2026-48784

MEDIUM

Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization

Title source: cna
STIX 2.1

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.

References (5)

Core 5

Scores

CVSS v3 6.1
EPSS 0.0027
EPSS Percentile 18.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-172 CWE-601
Status published
Products (9)
sensiolabs/symfony < 5.4.53
symfony/routing < 5.4.53
symfony/routing >= 6.0.0-BETA1, < 6.4.41
symfony/routing >= 7.0.0-BETA1, < 7.4.13
symfony/routing >= 8.0.0-BETA1, < 8.0.13
symfony/symfony < 5.4.53
symfony/symfony >= 6.0.0-BETA1, < 6.4.41
symfony/symfony >= 7.0.0-BETA1, < 7.4.13
symfony/symfony >= 8.0.0-BETA1, < 8.0.13
Published Jul 14, 2026
Tracked Since Jul 15, 2026