{
  "affected": [
    {
      "affectedData": [
        {
          "product": "echo",
          "vendor": "labstack",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.0.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:labstack:echo:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "27FD7D9D-DB8A-4CC1-8024-72E6C1865D46",
              "versionEndExcluding": "5.0.3",
              "versionStartIncluding": "5.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Echo is a Go web framework. In versions 5.0.0 through 5.0.2 on Windows, Echo\u2019s `middleware.Static` using the default filesystem allows path traversal via backslashes, enabling unauthenticated remote file read outside the static root. In `middleware/static.go`, the requested path is unescaped and normalized with `path.Clean` (URL semantics). `path.Clean` does not treat `\\` as a path separator, so `..\\` sequences remain in the cleaned path. The resulting path is then passed to `currentFS.Open(...)`. When the filesystem is left at the default (nil), Echo uses `defaultFS` which calls `os.Open` (`echo.go:792`). On Windows, `os.Open` treats `\\` as a path separator and resolves `..\\`, allowing traversal outside the static root. Version 5.0.3 fixes the issue."
    },
    {
      "lang": "es",
      "value": "Echo es un marco web de Go. En las versiones 5.0.0 a 5.0.2 en Windows, el `middleware.Static` de Echo que utiliza el sistema de archivos predeterminado permite recorrer rutas mediante barras invertidas, lo que permite la lectura de archivos remotos no autenticados fuera de la ra\u00edz est\u00e1tica. En `middleware/static.go`, la ruta solicitada no se escapa y se normaliza con `path.Clean` (sem\u00e1ntica de URL). `path.Clean` no trata `\\` como un separador de ruta, por lo que las secuencias `..\\` permanecen en la ruta limpia. La ruta resultante se pasa entonces a `currentFS.Open(...)`. Cuando el sistema de archivos se deja en el valor predeterminado (nil), Echo utiliza `defaultFS`, que llama a `os.Open` (`echo.go:792`). En Windows, `os.Open` trata `\\` como un separador de ruta y resuelve `..\\`, lo que permite el recorrido fuera de la ra\u00edz est\u00e1tica. La versi\u00f3n 5.0.3 corrige el problema."
    }
  ],
  "id": "CVE-2026-25766",
  "lastModified": "2026-06-17T10:25:11.797",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-25766",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-19T19:45:33.220477Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-19T16:27:15.497",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/labstack/echo/commit/b1d443086ea27cf51345ec72a71e9b7e9d9ce5f1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/labstack/echo/pull/2891"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/labstack/echo/security/advisories/GHSA-pgvm-wxw2-hrv9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}