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CVE-2026-48784: Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization

medium Affects symfony/routing, symfony/symfony. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

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

Package
symfony/routing Composer
Affected versions
<5.4.53 or >=6.0.0 and <6.4.41 or >=7.0.0 and <7.4.13 or >=8.0.0 and <8.0.13 or >=2.0.0 and <3.0.0 or >=3.0.0 and <4.0.0 or >=4.0.0 and <5.0.0 or >=5.0.0 and <5.1.0 or >=5.1.0 and <5.2.0 or >=5.2.0 and <5.3.0 or >=5.3.0 and <5.4.0 or >=5.4.0 and <5.4.53 or >=6.0.0 and <6.1.0 or >=6.1.0 and <6.2.0 or >=6.2.0 and <6.3.0 or >=6.3.0 and <6.4.0 or >=6.4.0 and <6.4.41 or >=7.0.0 and <7.1.0 or >=7.1.0 and <7.2.0 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.13
Fixed in
5.4.53, 6.4.41, 7.4.13, 8.0.13
Severity
medium
Exploitation
not on CISA KEV · EPSS 0% (28.3th percentile)
Published
2026-06-15
Source
osv.dev

References

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

Package
symfony/symfony Composer
Affected versions
<5.4.53 or >=6.0.0 and <6.4.41 or >=7.0.0 and <7.4.13 or >=8.0.0 and <8.0.13 or >=2.0.0 and <3.0.0 or >=3.0.0 and <4.0.0 or >=4.0.0 and <5.0.0 or >=5.0.0 and <5.1.0 or >=5.1.0 and <5.2.0 or >=5.2.0 and <5.3.0 or >=5.3.0 and <5.4.0 or >=5.4.0 and <5.4.53 or >=6.0.0 and <6.1.0 or >=6.1.0 and <6.2.0 or >=6.2.0 and <6.3.0 or >=6.3.0 and <6.4.0 or >=6.4.0 and <6.4.41 or >=7.0.0 and <7.1.0 or >=7.1.0 and <7.2.0 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.13
Fixed in
5.4.53, 6.4.41, 7.4.13, 8.0.13
Severity
medium
Exploitation
not on CISA KEV · EPSS 0% (28.3th percentile)
Published
2026-06-15
Source
osv.dev

References

CWE-172CWE-601
NVD recordsymfony/routing advisoriessymfony/symfony advisories

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