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CVE-2026-41586
critical
CVSS 9.8
Unsafe Deserialization in hyperledger-fabric-orderer (CVE-2026-41586)
Summary
vulnerability in hyperledger-fabric-orderer (CVE-2026-41586). Successful exploitation can lead to full system takeover. Exploitable via ``Channel.java``. Mitigation: upgrade to `2.5.9` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-41586** has been found in hyperledger-fabric-orderer.
Attackers can target a specific entry point like ``Channel.java`` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: upgrade hyperledger-fabric-orderer to **2.5.9** or later.
If unsure, ask your IT team or search "hyperledger-fabric-orderer CVE-2026-41586" on the vendor's site.
CVE-2026-41586 (hyperledger-fabric-orderer) — CWE-502 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `Channel.java` / `ObjectInputFilter`
Patched: `2.5.9` — 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
**unsafe deserialization** (CWE-502) exists in hyperledger-fabric-orderer. Attackers reach the vulnerable code path via ``Channel.java`` without authentication.
📍 Affected scope
hyperledger-fabric-orderer — . Attack surface: `Channel.java` / `ObjectInputFilter`.
🔥 Severity
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **2.5.9**.
🛡️ 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 'hyperledger-fabric-orderer' .` 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 'hyperledger-fabric-orderer' . | 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 `hyperledger-fabric-orderer` 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 hyperledger-fabric-orderer to 2.5.9ステージング環境で 2.5.9 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
Bitnami
hyperledger-fabric-orderer
[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"2.5.9"}]}]
Bitnami
hyperledger-fabric-peer
[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"2.5.9"}]}]
Bitnami
hyperledger-fabric-tools
[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"2.5.9"}]}]
Maven
org.hyperledger.fabric-sdk-java:fabric-sdk-java
[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.0"},{"last_affected":"2.2.26"}]}]