Jellyfin: Potential FFmpeg argument injection via unescaped subtitle file path

{
  "id": "eb94a31710db549062c024344a936f2265ba8f3b909b654dac732e5d694e7c7f",
  "url": "https://osv.dev/vulnerability/CVE-2026-48793",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Jellyfin: Potential FFmpeg argument injection via unescaped subtitle file path",
    "summary": "Jellyfin is an open source self hosted media server. Prior to 10.11.10, a potential FFmpeg argument injection vulnerability exists in the subtitle conversion code path. SubtitleEncoder.ConvertTextSubtitleToSrtInternal (SubtitleEncoder.cs, line 382) interpolates the subtitle file path into FFmpeg command-line arguments without calling EncodingUtils.NormalizePath(). On Linux, filenames can contain double-quote characters, which break the argument quoting and allow injection of arbitrary FFmpeg arguments. The vulnerability is reachable without authentication via SubtitleController.GetSubtitle, which has no [Authorize] attribute. An attacker who can place a file in a Jellyfin media library directory (shared NAS, Samba share, guest upload) can achieve arbitrary file write on the server and information disclosure. This vulnerability is fixed in 10.11.10.",
    "evidence": "osv:CVE-2026-48793",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-48793",
      "aliases": [
        "CVE-2026-48793",
        "GHSA-wwwm-px48-fpvq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jellyfin/jellyfin",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4b4b4cd94d8d3fe20b2b2b576edbc5cfa933fe07"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "10.11.10"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "10.11.10"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v10.11.9",
            "v10.11.8",
            "v10.11.7",
            "v10.11.6",
            "v10.11.5",
            "v10.11.4",
            "v10.11.3",
            "v10.11.2",
            "v10.11.1",
            "v10.11.0",
            "v10.11.0-rc9",
            "v10.11.0-rc8",
            "v10.11.0-rc7",
            "v10.11.0-rc6",
            "v10.11.0-rc5",
            "v10.11.0-rc4",
            "v10.11.0-rc3",
            "v10.11.0-rc2",
            "v10.11.0-rc1",
            "v10.8.0-alpha5",
            "v10.8.0-alpha4",
            "v10.8.0-alpha3",
            "v10.8.0-alpha2",
            "v10.8.0-alpha1",
            "v10.6.0",
            "v10.5.0",
            "v10.4.0",
            "v10.0.1",
            "v10.0.0",
            "v10.0.2",
            "v3.5.2-5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48793.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.359341887Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48793.json",
        "https://github.com/jellyfin/jellyfin/security/advisories/GHSA-wwwm-px48-fpvq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-48793"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-88"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48793.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-48793",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489625,
  "published_at": "2026-06-24T18:22:18.293+00:00"
}