CVE-2026-30975

HIGH

8.1

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.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published3/25/2026

Last Modified3/30/2026

Sourcenvd

Honeypot Sightings0

Affected Products

sonarr:sonarr

Weaknesses (CWE)

CWE-290

References

https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2942(security-advisories@github.com)

https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2944(security-advisories@github.com)

https://github.com/Sonarr/Sonarr/security/advisories/GHSA-h5qx-5hjf-7c9r(security-advisories@github.com)

IOC Correlations

No correlations recorded

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