echo v4.15.4 security fix for encoded path separators in static file URLs

{
  "id": "f8fc6f39e12cff92d3cc49e0549c697150315f9ea9138016759dad1eebada841",
  "url": "https://github.com/labstack/echo/releases/tag/v4.15.4",
  "method": "llm",
  "payload": {
    "kind": "patch",
    "title": "echo v4.15.4 security fix for encoded path separators in static file URLs",
    "summary": "This release fixes a path-handling issue that could let encoded separators bypass route-level middleware and expose static files. Static serving no longer unescapes paths by default; users who rely on URL-encoded filenames must opt in to the previous behavior.",
    "evidence": "Security Fixes GHSA-vfp3-v2gw-7wfq: an encoded path separator (%2F or %5C) in a static file URL could bypass route-level middleware (e.g. authentication on a sibling route) and disclose static files.",
    "products": [
      {
        "name": {
          "value": "echo",
          "evidence": "Release notes from echo"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "v4.15.4",
            "evidence": "v4.15.4"
          }
        ],
        "affected_versions": [
          {
            "value": "v4.15.3",
            "evidence": "Full Changelog: v4.15.3...v4.15.4"
          }
        ]
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "github-labstack-echo",
  "document_id": 21594,
  "published_at": "2026-06-15T18:28:20+00:00"
}