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TI-2026-36518 Aliases CVE-2026-49340GHSA-4gxv-p5g5-j7w7

Path traversal in sentriz gonic

Priority HIGH 70CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00314 24th percentileScored 2026-11-07
Fix Fixed gonic (sentriz): 0.21.0go.senan.xyz/gonic (Go): 0.21.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sentrizgonicbefore 0.21.00.21.0Patch availableCNA
—go.senan.xyz/gonic (Go)before 0.21.00.21.0Patch availableGHSA-4gxv-p5g5-j7w7
  • gonic Vendorsentriz Affected before 0.21.0 Fixed in 0.21.0 Patch available CNA
  • go.senan.xyz/gonic (Go) Vendor— Affected before 0.21.0 Fixed in 0.21.0 Patch available GHSA-4gxv-p5g5-j7w7

Remediation

  • Fix · CNA gonic (sentriz) Fixed in 0.21.0
  • Fix · GHSA-4gxv-p5g5-j7w7 go.senan.xyz/gonic (Go) Fixed in 0.21.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49340
  2. 2026-10-03 Alias added: GHSA-4gxv-p5g5-j7w7

References

Advisory 1

Other 2

  • TI-2026-36517 Path traversal in sentriz gonic CVSS 3.1HIGH 7.1
  • TI-2026-36516 Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR) CVSS 3.1HIGH 7.1
  • TI-2026-58917 gonic before 0.22.0 Missing Administrator Check on the Subsonic startScan Endpoint CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences