CVE-2026-49340

High

Description

gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, a logic error in `ServeCreateOrUpdatePlaylist` allows any authenticated Subsonic user (including non-admin) to write playlist M3U content to an attacker-controlled absolute filesystem path on the gonic host, and to create intermediate directories with `0o777` permissions. The bug is independent of CVE-2026-49338 and CVE-2026-49339. It is an unreachable guard clause combined with no path containment in `Store.Write`. Version 0.21.0 patches the issue.

SeverityHigh

CVSS8.1

Exploit probability—

ProductGo.senan.xyz/gonic

PublishedJun 19, 2026

First seenJun 19, 2026

Weakness typeCWE-22Path traversal CWE-697CWE-697 CWE-732CWE-732

How to fix

Update

go.senan.xyz/gonic0.21.0 or later

Affected products

Product	Affected versions	Fixed in
go.senan.xyz/gonicGo	v < 0.21.0	0.21.0

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