# CVE-2026-30976: Sonarr Path Traversal vulnerability

> Unauthenticated attackers can read arbitrary files on Windows systems via path traversal, exposing sensitive configuration and system data.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Mar 2026
- **Updated:** 26 Mar 2026
- **Also known as:** GHSA-h393-v5hm-6h8f

## What is CVE-2026-30976?

CVE-2026-30976 is a high-severity path traversal vulnerability in Sonarr, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Sonarr is a PVR for Usenet and BitTorrent users. In versions on the 4.x branch prior to 4.0.17.2950, an unauthenticated remote attacker can potentially read any file readable by the Sonarr process. These include application configuration files (containing API keys and database credentials), Windows system files, and any user-accessible files on the same drive This issue only impacts Windows systems; macOS and Linux are unaffected. Files returned from the API were not limited to the directory on disk they were intended to be served from. This problem has been patched in 4.0.17.2950 in the nightly/develop branch or 4.0.17.2952 for stable/main releases. It's possible to work around the issue by only hosting Sonarr on a secure internal network and accessing it via VPN, Tailscale or similar solution outside that network.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-30976?

It affects 1 product.


Products: Sonarr Sonarr.

## How do I fix CVE-2026-30976?

No fix has been published for CVE-2026-30976 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-30976 being exploited?

There is no known exploitation of CVE-2026-30976 in the wild and no public exploit code.

## Other vulnerabilities in Sonarr

- [CVE-2026-30975](https://insights.sbomify.com/CVE-2026-30975/): Sonarr Authentication Bypass vulnerability (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-30976 and fix it if it is affected.

What it is: CVE-2026-30976 is a high-severity path traversal vulnerability in Sonarr, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-30976 in the wild and no public exploit code.

Affected product: Sonarr. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-30976/ (Markdown: https://insights.sbomify.com/CVE-2026-30976/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-30976
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-30976
- OSV: https://osv.dev/vulnerability/CVE-2026-30976

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-30976/
Summaries are generated and may contain mistakes; the official description above is the record.