CVE-2026-48784 json
Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization
published 2026-06-15 4 mo ago modified 2026-09-10 1 mo ago also GHSA-h5x3-xfc9-m39h , EUVD-2026-44371
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist symfony/routing 5.4.53, 6.4.41, 7.4.13, 8.0.13
- packagist symfony/symfony 5.4.53, 6.4.41, 7.4.13, 8.0.13
- sensiolabs symfony 5.4.53, 6.4.41, 7.4.13, 8.0.13
- symfony Debian 12 5.4.53+dfsg-0+deb12u1
- symfony Debian 13 6.4.41+dfsg-0+deb13u1
- symfony Debian 14 7.4.13+dfsg-1
debian advisories DEBIAN-CVE-2026-48784
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 4.0 | 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 | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/routing | <5.4.53 >=6.0.0, <6.4.41 >=7.0.0, <7.4.13 >=8.0.0, <8.0.13 |
5.4.53 6.4.41 7.4.13 8.0.13 |
| packagist | symfony/symfony | <5.4.53 >=6.0.0, <6.4.41 >=7.0.0, <7.4.13 >=8.0.0, <8.0.13 |
5.4.53 6.4.41 7.4.13 8.0.13 |
Affected products
- symfony symfony
- symfony routing
Classification
References
-
github.com
/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d
web, patch
-
github.com
/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h
web, patch, vendor-advisory
-
github.com
/symfony/symfony/releases/tag/v5.4.53
product, release-notes
-
github.com
/symfony/symfony/releases/tag/v6.4.41
product, release-notes
-
github.com
/symfony/symfony/releases/tag/v7.4.13
product, release-notes
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/routing/CVE-2026-48784.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48784.yaml
web
-
github.com
/symfony/symfony
package
-
symfony.com
/cve-2026-48784
web
Sources
- CVE List CVE-2026-48784
- GitHub Advisory GHSA-h5x3-xfc9-m39h
- NVD CVE-2026-48784
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