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CVE-2026-39386
Vulnerability in github.com/m1k1o/neko/server (CVE-2026-39386)
Summary
vulnerability in github.com/m1k1o/neko/server (CVE-2026-39386). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `0.0.0-20260406184107-c54bcf1ee211` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-39386** has been found in github.com/m1k1o/neko/server.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
What to do: upgrade github.com/m1k1o/neko/server to **0.0.0-20260406184107-c54bcf1ee211** or later.
If unsure, ask your IT team or search "github.com/m1k1o/neko/server CVE-2026-39386" on the vendor's site.
CVE-2026-39386 (github.com/m1k1o/neko/server) — CWE-20 /
Attack vector: remote (network-reachable) / no user interaction
Patched: `0.0.0-20260406184107-c54bcf1ee211` — 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
**A vulnerability** (CWE-20) exists in github.com/m1k1o/neko/server.
📍 Affected scope
github.com/m1k1o/neko/server — .
🔥 Severity
Severity: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **0.0.0-20260406184107-c54bcf1ee211**.
🛡️ 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 'github.com/m1k1o/neko/server' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'github.com/m1k1o/neko/server' . | 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 `github.com/m1k1o/neko/server` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade github.com/m1k1o/neko/server to 0.0.0-20260406184107-c54bcf1ee211ステージング環境で 0.0.0-20260406184107-c54bcf1ee211 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Go
github.com/m1k1o/neko/server
[{"type":"SEMVER","events":[{"introduced":"0.0.0-20250322225643-212bf8a60756"},{"fixed":"0.0.0-20260406184107-c54bcf1ee211"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-39386
- package https://github.com/m1k1o/neko
- web https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf
- web https://github.com/m1k1o/neko/commit/6b561feb9016badea99ae7305091c0ff55e1d114
- web https://github.com/m1k1o/neko/commit/c54bcf1ee211e28104a2bb6db59583a39c4a4d6e
- web https://github.com/m1k1o/neko/releases/tag/v3.0.11
- web https://github.com/m1k1o/neko/releases/tag/v3.1.2