Vulnerability in github.com/portainer/portainer (CVE-2026-44848)
Summary
vulnerability in github.com/portainer/portainer (CVE-2026-44848). Successful exploitation can lead to full system takeover. Exploitable via `POST /plugins/pull`. Mitigation: upgrade to `2.41.0` or later.
AI summary snake-internal / snake-material-v2
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/portainer/portainer' . | 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/portainer/portainer` 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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3Hunt for indicators of compromise detect
grep 'POST /plugins/pull' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `POST /plugins/pull` 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。
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5Apply temporary workaround mitigate
Administrators who cannot immediately upgrade can reduce exposure by temporarily **revoking Docker endpoint access for non-admin users** via Portainer RBAC until the patched release is deployed.パッチが適用されるまでの応急処置として、Administrators who cannot immediately upgrade can reduce exposure by temporarily **revoking Docker endpoint access for non-admin users** via Portainer RBAC until the patched release is deployed. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade github.com/portainer/portainer to 2.41.0ステージング環境で 2.41.0 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
Replay attack against POST /plugins/pull 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
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-44848
- package https://github.com/portainer/portainer
- web https://github.com/portainer/portainer/security/advisories/GHSA-rrmm-9v76-h3p4
- web https://github.com/portainer/portainer/releases/tag/2.33.8
- web https://github.com/portainer/portainer/releases/tag/2.39.2
- web https://github.com/portainer/portainer/releases/tag/2.41.0
- web https://github.com/advisories/GHSA-rrmm-9v76-h3p4