CVE-2021-29488: Sabnzbd

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

SABnzbd is an open source binary newsreader. A vulnerability was discovered in SABnzbd that could trick the `filesystem.renamer()` function into writing downloaded files outside the configured Download Folder via malicious PAR2 files. A patch was released as part of SABnzbd 3.2.1RC1. As a workaround, limit downloads to NZBs without PAR2 files, deny write permissions to the SABnzbd process outside areas it must access to perform its job, or update to a fixed version.

Affected products

• Sabnzbd Sabnzbd: before 3.0.0 (fixed in 3.0.0); before 3.2.1 (fixed in 3.2.1)

Published 2021-05-07. Last modified 2026-06-17.