Is symfony/routing 2.3 vulnerable?

Composer · 43 releases from 2.3.0 to 2.3.42 · latest symfony/routing is 8.1.10 · checked 2 Nov 2026

Yes: 2 known advisories

Yes. symfony/routing 2.3.42, the last 2.3 release, is affected by 2 known security advisories (2 medium), including CVE-2026-48784, CVE-2026-45065. Upgrade to 5.4.53 or later to fix all of them.

Upgrade with:composer require symfony/routing:^5.4.53

Is your project affected?

Private repo? Upload its lockfile instead, or connect GitHub to check every repo.

Advisories affecting symfony/routing 2.3.42

  • MediumCVE-2026-48784GHSA-h5x3-xfc9-m39h15 Jun 2026

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

    Affected
    <5.4.53 · >=6.0.0 <6.4.41 · >=7.0.0 <7.4.13 · >=8.0.0 <8.0.13
    Fixed in
    5.4.53, 6.4.41, 7.4.13, 8.0.13
  • MediumCVE-2026-45065GHSA-72xp-p242-47p927 May 2026

    Symfony has a UrlGenerator Route-Requirement Bypass via Unanchored Regex Alternation → Off-Site //host URL Injection

    Affected
    <5.4.52 · >=6.0.0 <6.4.40 · >=7.0.0 <7.4.12 · >=8.0.0 <8.0.12
    Fixed in
    5.4.52, 6.4.40, 7.4.12, 8.0.12

Which of your client projects are still on symfony/routing 2.3?

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Other symfony/routing versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the Composer registry. Refreshed daily.