CVE-2026-118656

{
  "id": "CVE-2026-118656",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-28T21:16:55.550",
  "lastModified": "2026-10-29T18:17:27.827",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "labstack",
          "product": "echo",
          "versions": [
            {
              "version": ">= 5.0.0, < 5.4.0",
              "status": "affected"
            },
            {
              "version": "< 4.16.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-29T15:29:15.771728Z",
          "id": "CVE-2026-118656",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/labstack/echo/releases/tag/v4.16.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/labstack/echo/releases/tag/v5.4.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48",
      "source": "[email protected]"
    }
  ]
}