CVE-2026-48784mediumCWE-172CWE-601

CVE-2026-48784: medium-severity vulnerability in symfony

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

Published · Updated

Follow this CVE+ Monitor symfony+ Monitor routing

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.1epss 0.3%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
symfony · routingsymfony · symfony
Related CVEs — symfony

In the same product, most dangerous first.

CVE-2024-50340HIGHAbility to change environment from query in symfony/runtimeEPSS 61.8%CVE-2022-24894MEDIUMSymfony storing cookie headers in HttpCacheEPSS 4.0%CVE-2020-15094HIGHRCE in SymfonyEPSS 3.0%CVE-2021-21424MEDIUMPrevent user enumeration using Guard or the new Authenticator-based SecurityEPSS 1.6%CVE-2026-47212MEDIUMSymfony: Twilio Notifier Webhook Parser Never Verifies the X-Twilio-Signature HMAC: Unauthenticated Webhook Event InjectionEPSS 1.5%CVE-2025-64500HIGHSymfony's incorrect parsing of PATH_INFO can lead to limited authorization bypassEPSS 1.4%