Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization (symfony symfony)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.35 % · percentile 28 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Weaknesses (CWE)
References
- https://github.com/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h
- https://github.com/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d
- https://github.com/symfony/symfony/releases/tag/v5.4.53
- https://github.com/symfony/symfony/releases/tag/v6.4.41
- https://github.com/symfony/symfony/releases/tag/v7.4.13
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | MEDIUM 5.1 | 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 | GitHub_M |
| CVSS 4.0 | MEDIUM 5.1 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | MEDIUM 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-h5x3-xfc9-m39h — Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization
European references
- ENISA EUVD · EUVD-2026-44371
- GCVE · GCVE-0-2026-48784
CERT-FR advisories
- CERTFR-2026-AVI-0653 — Multiples vulnérabilités dans Symfony · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*< 5.4.53cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*≥ 6.0.0 < 6.4.41cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*≥ 7.0.0 < 7.4.13cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*≥ 8.0.0 < 8.0.13
Affected products
| Product | Versions |
|---|---|
| symfony · symfony | 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 |
| symfony · routing | 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 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |