← Back
CVE-2026-55388
high
CVSS 8.1
Code Injection in piscina (CVE-2026-55388)
Summary
code injection in piscina (CVE-2026-55388). Successful exploitation can lead to full system takeover. Exploitable via `POST /upload`. Mitigation: upgrade to `6.0.0-rc.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-55388** has been found in piscina.
Attackers can target a specific entry point like `POST /upload` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade piscina to **6.0.0-rc.2** or later.
If unsure, ask your IT team or search "piscina CVE-2026-55388" on the vendor's site.
CVE-2026-55388 (piscina) — CWE-94 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: POST /upload / POST /api/settings / POST /api/process / `piscina`
Patched: `6.0.0-rc.2` — 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
**arbitrary code execution** (CWE-94) exists in piscina. Attackers reach the vulnerable code path via `POST /upload` without authentication.
📍 Affected scope
piscina — . Attack surface: POST /upload / POST /api/settings / POST /api/process / `piscina`.
🔥 Severity
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **6.0.0-rc.2**.
🛡️ 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 `POST /upload` requests with malformed payloads or SQL meta-characters. Run `grep -r 'piscina' .` 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
-
1Identify exposure identify
grep -r 'piscina' . | 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 `piscina` を grep し、稼働しているサービス・バージョンを把握する。
-
3Hunt for indicators of compromise detect
grep 'POST /upload' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `POST /upload` への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。
-
6Apply patch patch
Upgrade piscina to 6.0.0-rc.2ステージング環境で 6.0.0-rc.2 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。
-
7Post-deployment verification verify
Replay attack against POST /upload on staging to confirm patch closes the vector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
npm
piscina
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.0-rc.2"}]}]