Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization
Published Jul 14, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.35%
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.
Affected products
-
- Version < 5.4.53StatusaffectedConstraints-
- Version >= 6.0.0-BETA1, < 6.4.41StatusaffectedConstraints-
- Version >= 7.0.0-BETA1, < 7.4.13StatusaffectedConstraints-
- Version >= 8.0.0-BETA1, < 8.0.13StatusaffectedConstraints-
- Version
-
- Version < 5.4.53StatusaffectedConstraints-
- Version >= 6.0.0-BETA1, < 6.4.41StatusaffectedConstraints-
- Version >= 7.0.0-BETA1, < 7.4.13StatusaffectedConstraints-
- Version >= 8.0.0-BETA1, < 8.0.13StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Symfony | Routing | n/a |
| |||||||||||||||
| Symfony | Symfony | n/a |
|
- < 5.4.53
- ≥ 6.0.0 · < 6.4.41
- ≥ 7.0.0 · < 7.4.13
- ≥ 8.0.0 · < 8.0.13
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
2 other sources (GitHub, NVD) ▾
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
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Jul 15, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Jun–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.35% (0.00348) | 26.02th | v5 (v2026.06.15) |
| Jul 15, 2026 | 0.42% (0.00419) | 33.91th | v5 (v2026.06.15) |
| Jun 12, 2026 | 0.03% (0.00026) | 7.70th | v4 (v2025.03.14) |
References (9)
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/routing/CVE-2026-48784.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48784.yaml
- https://github.com/advisories/GHSA-h5x3-xfc9-m39h Advisory
- https://github.com/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d x_refsource_MISCPatch
- https://github.com/symfony/symfony/releases/tag/v5.4.53 x_refsource_MISCProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v6.4.41 x_refsource_MISCProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v7.4.13 x_refsource_MISCProductRelease Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h x_refsource_CONFIRMPatchVendor Advisory
- https://symfony.com/cve-2026-48784
| Link | Providers | Tags |
|---|---|---|
| https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/routing/CVE-2026-48784.yaml | ||
| https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48784.yaml | ||
| https://github.com/advisories/GHSA-h5x3-xfc9-m39h | Advisory | |
| https://github.com/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d | x_refsource_MISCPatch | |
| https://github.com/symfony/symfony/releases/tag/v5.4.53 | x_refsource_MISCProductRelease Notes | |
| https://github.com/symfony/symfony/releases/tag/v6.4.41 | x_refsource_MISCProductRelease Notes | |
| https://github.com/symfony/symfony/releases/tag/v7.4.13 | x_refsource_MISCProductRelease Notes | |
| https://github.com/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h | x_refsource_CONFIRMPatchVendor Advisory | |
| https://symfony.com/cve-2026-48784 |
Change history (0)
No recorded changes yet.