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CVE-2026-66063 medium CVSS 6.5

Path Traversal in goshs.de/goshs/v2 (CVE-2026-66063)

Summary

Path traversal in goshs.de/goshs/v2 (CVE-2026-66063). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.1.5-0.20260727065949-f3ef599e4091 or later.

Original description

The description as published by the source.

Summary

The multipart upload filename fix splits on the path separator but never rejects dot-dot, allowing a write outside the served tree.

Finding (Medium): upload filename escapes the served tree (residual of CVE-2026-35393)

The multipart filename fix (updown.go lines 135-136) splits on the path separator but never rejects "..". Uploading with filename=".." results in os.Create against the parent of the upload folder with a trailing marker character, outside the served tree, and the subsequent failed rename leaves that file behind. Verified: a file containing ESCAPED_WRITE_PROOF was written outside the webroot, unauthenticated, with the default configuration. Not claimed: a Windows-specific variant (Go's Part.FileName() already applies filepath.Base).

Suggested fixes

  1. Reject any upload filename that is "..", is empty after sanitisation, or resolves outside the upload folder; validate the final resolved destination rather than only transforming the input.

Tooling

AI assistance was used while investigating. The finding was reproduced against a running server on loopback.

Source: GitHub Security Advisories (Global) 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-2026-66063 has been found in goshs.de/goshs/v2.
Risk of unauthorized operations or information disclosure. CVSS score: 6.5/10.
What to do: upgrade goshs.de/goshs/v2 to 2.1.5-0.20260727065949-f3ef599e4091 or later.
If unsure, ask your IT team or search "goshs.de/goshs/v2 CVE-2026-66063" on the vendor's site.

CVE-2026-66063 (goshs.de/goshs/v2) — CWE-22 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 2.1.5-0.20260727065949-f3ef599e4091 — 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.

❓ What is the problem

Path traversal (CWE-22) exists in goshs.de/goshs/v2.

📍 Affected scope

Check the vendor advisory for the affected versions of goshs.de/goshs/v2.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 2.1.5-0.20260727065949-f3ef599e4091.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'goshs.de/goshs/v2' . 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

  1. 1
    Identify exposure identify 
    grep -r 'goshs.de/goshs/v2' . | 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 goshs.de/goshs/v2 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade goshs.de/goshs/v2 to 2.1.5-0.20260727065949-f3ef599e4091

    ステージング環境で 2.1.5-0.20260727065949-f3ef599e4091 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。

  3. 3
    Post-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

go goshs.de/goshs/v2
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.5-0.20260727065949-f3ef599e4091"}]}]
go github.com/patrickhener/goshs/v2
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.5-0.20260727065949-f3ef599e4091"}]}]
go goshs.de/goshs
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.1.4"}]}]
go github.com/patrickhener/goshs
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.1.4"}]}]

References

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