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.
Original description
The description as published by the source.
Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions and applications. From versions 1.0.0 to 2.2.26, Channel.java implements readObject() and exposes deSerializeChannel() which call ObjectInputStream.readObject() on untrusted byte arrays without configuring an ObjectInputFilter. This is a classic Java deserialization RCE pattern. At time of publication, there are no publicly available patches.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2026-41586 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.
Unsafe deserialization (CWE-502) exists in hyperledger-fabric-orderer. Attackers reach the vulnerable code path via Channel.java without authentication.
Check the vendor advisory for the affected versions of hyperledger-fabric-orderer. Attack surface: Channel.java / ObjectInputFilter.
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.
Update to 2.5.9.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
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。 -
2Apply 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を含めること。
-
3Post-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
References
- advisory github.com
- package github.com
- package github.com
- web hyperledger.github.io
- web nvd.nist.gov
- web github.com