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Sonarr Authentication Bypass vulnerability

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-30975
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 04:36 UTC · Revision 1

Source evidence

Sonarr Authentication Bypass vulnerability

core-osv · Original source

Published 25 Mar 2026, 21:08 UTC

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.

osv:CVE-2026-30975
Complete source record
{
  "id": "bbb6005dd75f14d9a33eb7f5433c047079417811bdb6ba97a543d874a727ed7c",
  "url": "https://osv.dev/vulnerability/CVE-2026-30975",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Sonarr Authentication Bypass vulnerability",
    "summary": "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.",
    "evidence": "osv:CVE-2026-30975",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-30975",
      "aliases": [
        "CVE-2026-30975",
        "GHSA-h5qx-5hjf-7c9r"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sonarr/sonarr",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8c5091949933daaad15f9b7660ce81b9f9fee25d"
                },
                {
                  "fixed": "52972e7efcce800560cbbaa64f5f76aaef6cbe77"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sonarr:sonarr:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.0.16.2942"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8c5091949933daaad15f9b7660ce81b9f9fee25d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.0.16.2942"
                  },
                  {
                    "range": [
                      {
                        "fixed": "52972e7efcce800560cbbaa64f5f76aaef6cbe77"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.0.16.2944"
                  }
                ]
              }
            }
          ],
          "versions": [
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30975.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.484865085Z",
      "provider": "osv",
      "references": [
        "https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2942",
        "https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2944",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30975.json",
        "https://github.com/Sonarr/Sonarr/security/advisories/GHSA-h5qx-5hjf-7c9r",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-30975"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-290"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30975.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-30975",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500330,
  "published_at": "2026-03-25T21:08:15.426+00:00"
}