{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.15.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e02bf451b3a5d0362531f1bd620778b380053565"
            }
          ],
          "repo": "https://github.com/webp-sh/webp_server_go",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53779.json"
  },
  "details": "WebP Server Go through 0.14.4 contains a path traversal vulnerability on Windows that allows unauthenticated attackers to read files outside the configured IMG_PATH directory by sending requests with percent-encoded backslashes (%5C) that bypass the path.Clean() sanitization in handler/router.go. Attackers can exploit the discrepancy between Go's forward-slash-only path normalization and Windows file system APIs that treat backslashes and forward slashes as equivalent to access arbitrary files on the host filesystem accessible to the server process.",
  "id": "CVE-2026-53779",
  "modified": "2026-08-07T11:31:10.119740475Z",
  "published": "2026-06-22T18:22:40.698Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53779.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53779"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/webp-server-go-path-traversal-via-backslash-encoding-on-windows"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/webp-sh/webp_server_go/pull/451"
    },
    {
      "type": "FIX",
      "url": "https://github.com/webp-sh/webp_server_go/commit/eb3b5f9289b331cb639cd610b0d1c532d2cc24e0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/webp-sh/webp_server_go"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "WebP Server Go \u003c 0.15.0 Path Traversal via Backslash Encoding on Windows"
}