{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "4.16.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "5.0.0"
                  },
                  {
                    "fixed": "5.4.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "b838391e2eade87ae7e5a09d7bb5087bec271ec1"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "fc410094b2f3415cf2bf5204082137b205bfd5af"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v4.16.0",
                "range": [
                  {
                    "fixed": "e75c6c6d0c99602336fcf2c6bf6c8475ee160683"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "original_tag": "v5.4.0",
                "range": [
                  {
                    "fixed": "fc410094b2f3415cf2bf5204082137b205bfd5af"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e75c6c6d0c99602336fcf2c6bf6c8475ee160683"
            },
            {
              "introduced": "9500f2745481e2dff1313e2e6734c488e80c13fb"
            },
            {
              "fixed": "fc410094b2f3415cf2bf5204082137b205bfd5af"
            },
            {
              "fixed": "b838391e2eade87ae7e5a09d7bb5087bec271ec1"
            }
          ],
          "repo": "https://github.com/labstack/echo",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r7w9-592q-9vg4"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-352"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118266.json"
  },
  "details": "Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's MethodOverride middleware accepts a safe HTTP method as the override target for a POST request. When MethodOverride is registered before CSRF in the post-routing middleware chain, route selection retains the original state-changing POST handler but the override changes the method before CSRF evaluates it, causing both token validation and Sec-Fetch-Site checks to be skipped. A cross-site exploit requires an authenticated victim and an override value that a browser-submitted request can control, such as the form getter used by the advisory reproducer; the default X-HTTP-Method-Override header getter is not settable by a cross-site form. This issue is fixed in 4.16.0 and 5.4.0.",
  "id": "CVE-2026-118266",
  "modified": "2026-10-29T10:31:11.018447840Z",
  "published": "2026-10-28T19:21:47.729Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118266.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af"
    },
    {
      "type": "WEB",
      "url": "https://github.com/labstack/echo/releases/tag/v4.16.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/labstack/echo/releases/tag/v5.4.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118266"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method"
}