{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.0.16.2942"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8c5091949933daaad15f9b7660ce81b9f9fee25d"
            }
          ],
          "repo": "https://github.com/sonarr/sonarr",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h5qx-5hjf-7c9r"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-290"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30975.json"
  },
  "details": "Sonarr is a PVR for Usenet and BitTorrent users. Versions prior to 4.0.16.2942 have an authentication bypass that affected users that had disabled authentication for local addresses (Authentication Required set to: `Disabled for Local Addresses`) without a reverse proxy running in front of Sonarr that didn't not pass through the invalid header. Patches are available in version 4.0.16.2942 in the nightly/develop branch and version 4.0.16.2944 for stable/main releases. Some workarounds are available. Make sure Sonarr's Authentication Required setting is set to `Enabled`, run Sonarr behind a reverse proxy, and/or do not expose Sonarr directly to the internet and instead rely on accessing it through a VPN, Tailscale or a similar solution.",
  "id": "CVE-2026-30975",
  "modified": "2026-04-01T23:08:37.686652054Z",
  "published": "2026-03-25T21:08:15.426Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30975.json"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2942"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2944"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Sonarr/Sonarr/security/advisories/GHSA-h5qx-5hjf-7c9r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30975"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sonarr Authentication Bypass vulnerability"
}