Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sonarr | Sonarr | < 4.0.16.2942 |
Related Weaknesses (CWE)
References
- https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2942Release Notes
- https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2944Release Notes
- https://github.com/Sonarr/Sonarr/security/advisories/GHSA-h5qx-5hjf-7c9rVendor Advisory
FAQ
What is CVE-2026-30975?
CVE-2026-30975 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 Re...
How severe is CVE-2026-30975?
CVE-2026-30975 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-30975?
Check the references section above for vendor advisories and patch information. Affected products include: Sonarr Sonarr.