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CVE-2026-30976 is a path traversal vulnerability in Sonarr affecting versions in the 4.x branch prior to 4.0.17.2950/4.0.17.2952. On affected Windows installations, files returned from the API were not properly constrained to the intended on-disk directory, allowing an unauthenticated remote attacker to request and read arbitrary files accessible to the Sonarr process. Exposed data can include Sonarr configuration files containing API keys and database credentials, Windows system files, and other user-accessible files on the same drive. The issue is specific to Windows; macOS and Linux are not affected.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.