Riskcovery

CVE-2026-48784

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

State
Published
Severity
5.1 Medium
Published
Jul 14, 2026
Updated
Jul 15, 2026
Reserved
May 22, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.05.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:NGitHub_M

Weaknesses

  • CWE-172 Encoding Error
  • CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Affected Products

ProductVersions
symfonysymfony
  • < 5.4.53Affected
  • >= 6.0.0-BETA1, < 6.4.41Affected
  • >= 7.0.0-BETA1, < 7.4.13Affected
  • >= 8.0.0-BETA1, < 8.0.13Affected
routingsymfony
  • < 5.4.53Affected
  • >= 6.0.0-BETA1, < 6.4.41Affected
  • >= 7.0.0-BETA1, < 7.4.13Affected
  • >= 8.0.0-BETA1, < 8.0.13Affected

References

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