CVE-2026-49339 gonic: Path Traversal in playlist `id` bypasses ownership check, enabling any user to read/delete other users' playlists
Authenticated users can bypass ownership checks via path traversal to read or delete other users' playlists and probe host files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49339?
CVE-2026-49339 is a high-severity path traversal vulnerability in sentriz gonic, published on 19 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
gonic is a music streaming server / free-software subsonic server API implementation. The maintainer's fix in commit `6dd71e6a3c966867ef8c900d359a7df75789f410` added an ownership check based on `playlist.UserID`. However, `playlist.UserID` is derived from the first path segment of the attacker-controlled playlist ID, with no path containment on the resolved file path. Any authenticated Subsonic user can therefore bypass the ownership check and read any other user's playlist, delete any other user's playlist, and probe arbitrary file paths on the host for existence/readability. This is a bypass of the boundary the `6dd71e6` fix is trying to enforce; it is closely related to the original GONIC-1 IDOR but uses a different primitive (path traversal in the `id` parameter rather than direct cross-user access). Commit 0824bed88f6bbc490ba28bf09d28e5dfeb07b445 in version 0.21.0 fixes the issue.
Which versions are affected by CVE-2026-49339?
3 open source packages ship an affected version, including go.senan.xyz/gonic.
| Package | Affected | Fixed in |
|---|---|---|
go.senan.xyz/gonic Go | All versions | 0.21.0 |
go.senan.xyz/gonic Go | All versions | 0.21.0 |
go.senan.xyz/gonic Go | All versions | 0.21.0 |
How do I fix CVE-2026-49339?
Upgrade go.senan.xyz/gonic to 0.21.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-49339 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49339 exists.
Sources
Also known as GHSA-2fp4-5v5c-4448, GO-2026-5825.