Path Traversal in go.senan.xyz/gonic (CVE-2026-49339)
Summary
Path traversal in go.senan.xyz/gonic (CVE-2026-49339). Data can be tampered with by attackers. Exploitable via playlist.UserID. Mitigation: upgrade to 0.21.0 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-49339 has been found in go.senan.xyz/gonic.
Attackers can target a specific entry point like playlist.UserID over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.1/10.
What to do: upgrade go.senan.xyz/gonic to 0.21.0 or later.
If unsure, ask your IT team or search "go.senan.xyz/gonic CVE-2026-49339" on the vendor's site.
CVE-2026-49339 (go.senan.xyz/gonic) — CWE-22 / CVSS v3 7.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: playlist.UserID / deletePlaylist / userIDFromPath / strconv.Atoi
Patched: 0.21.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Path traversal (CWE-22) exists in go.senan.xyz/gonic. Attackers reach the vulnerable code path via playlist.UserID.
Check the vendor advisory for the affected versions of go.senan.xyz/gonic. Attack surface: playlist.UserID / deletePlaylist / userIDFromPath / strconv.Atoi.
Severity: High (CVSS 7.1/10). Data can be tampered with by attackers.
Update to 0.21.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'go.senan.xyz/gonic' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'go.senan.xyz/gonic' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
go.senan.xyz/gonicを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade go.senan.xyz/gonic to 0.21.0ステージング環境で 0.21.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- web github.com