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CVE-2026-41586 Hyperledger Fabric

Affected softwareHyperledger Fabric
Severity9.3 Critical CVSS 4.0 2 scores
WeaknessDeserialization of untrusted data (CWE-502)
Published7 May 2026
Updated26 Oct 2026

Description

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.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: yes, technical impact: total.
  • Indexed PoC none indexed
  • EPSS 0.53% chance in 30 days

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Decided by A vulnerability class already blocked by an ARMR security rule
Finding Protected by Waratek's ARMR deserialization security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's weakness is CWE-502: Deserialization of Untrusted Data.
Candidate fix https://github.com/hyperledger/fabric/security/advisories/GHSA-prf8-cf2x-rhx7 : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

How to mitigate CVE-2026-41586

Apply the vendor's fix for Hyperledger Fabric. Until you can, Waratek RASP blocks exploitation with its deserialization and process rules. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

CVSS

9.3 CRITICAL v4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 4.0 9.3 CRITICAL CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X security-advisories@github.com Secondary published
CVSS 3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.hyperledger.fabric-sdk-java:fabric-sdk-java 1.0.0 none 2.2.26

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd hyperledger fabric generic ≥ 1.0.0 and ≤ 2.2.26
osv org.hyperledger.fabric-sdk-java fabric-sdk-java generic ≥ 1.0.0 and ≤ 2.2.26

References

URLTags
https://github.com/hyperledger/fabric/security/advisories/GHSA-prf8-cf2x-rhx7 advisory
https://github.com/hyperledger/fabric-sdk-java PACKAGE
https://hyperledger.github.io/fabric-gateway WEB

Timeline

Published2026-05-07By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.