Gotenberg: ExifTool Dangerous Tag Blocklist Bypass via Group-Prefixed Tag Names Allows Arbitrary File Rename and Move

{
  "id": "01c70f14ca8ded1020318ddb766d28a28a9a2793b5cbac98304b1b29a8324475",
  "url": "https://osv.dev/vulnerability/CVE-2026-40893",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gotenberg: ExifTool Dangerous Tag Blocklist Bypass via Group-Prefixed Tag Names Allows Arbitrary File Rename and Move",
    "summary": "Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, Gotenberg only checks if the tag is exactly FileName, so System:FileName slips right through and ExifTool happily renames the file. This allows remote attackers to move, rename, and change permissions for arbitrary files. This vulnerability is fixed in 8.31.0.",
    "evidence": "osv:CVE-2026-40893",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-40893",
      "aliases": [
        "CVE-2026-40893",
        "GHSA-62p3-hvxx-fxg4",
        "GO-2026-5162"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gotenberg/gotenberg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "db51f9026d13357aecc23e3c99ba6937ac09fbfc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "8.31.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "8.31.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v8.30.1",
            "v8.30.0",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40893.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.911264451Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40893.json",
        "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-62p3-hvxx-fxg4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40893"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-184",
          "CWE-73"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40893.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40893",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492441,
  "published_at": "2026-05-14T15:18:27.758+00:00"
}